64684732 has 48 divisors (see below), whose sum is σ = 137511360. Its totient is φ = 26030592.

The previous prime is 64684729. The next prime is 64684733. The reversal of 64684732 is 23748646.

It is a happy number.

It is a super-2 number, since 2×64684732² = 8368229107823648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64684733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28968 + ... + 31120.

It is an arithmetic number, because the mean of its divisors is an integer number (2864820).

Almost surely, 2^64684732 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 64684732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68755680).

64684732 is an abundant number, since it is smaller than the sum of its proper divisors (72826628).

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

64684732 is a wasteful number, since it uses less digits than its factorization.

64684732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 2228 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The square root of 64684732 is about 8042.6818910112. The cubic root of 64684732 is about 401.4214675910.

The spelling of 64684732 in words is "sixty-four million, six hundred eighty-four thousand, seven hundred thirty-two".