72731070 has 48 divisors (see below), whose sum is σ = 192319920. Its totient is φ = 19064832.

The previous prime is 72731041. The next prime is 72731077. The reversal of 72731070 is 7013727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72731077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1539 + ... + 12158.

It is an arithmetic number, because the mean of its divisors is an integer number (4006665).

Almost surely, 2^72731070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72731070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96159960).

72731070 is an abundant number, since it is smaller than the sum of its proper divisors (119588850).

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

72731070 is a wasteful number, since it uses less digits than its factorization.

72731070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13769 (or 13766 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 72731070 is about 8528.2512861665. The cubic root of 72731070 is about 417.4200690802.

Adding to 72731070 its reverse (7013727), we get a palindrome (79744797).

The spelling of 72731070 in words is "seventy-two million, seven hundred thirty-one thousand, seventy".