731520 has 96 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 193536.

The previous prime is 731509. The next prime is 731531. The reversal of 731520 is 25137.

It is an interprime number because it is at equal distance from previous prime (731509) and next prime (731531).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 731493 and 731502.

It is a congruent number.

It is an unprimeable number.

731520 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5697 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (26520).

2⁷³¹⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272960).

731520 is an abundant number, since it is smaller than the sum of its proper divisors (1814400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731520 is a wasteful number, since it uses less digits than its factorization.

731520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 731520 is about 855.2894246979. The cubic root of 731520 is about 90.1035844387.

Adding to 731520 its reverse (25137), we get a palindrome (756657).

The spelling of 731520 in words is "seven hundred thirty-one thousand, five hundred twenty".