64923136 has 40 divisors (see below), whose sum is σ = 137368440. Its totient is φ = 30547968.

The previous prime is 64923109. The next prime is 64923143. The reversal of 64923136 is 63132946.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4975 + ... + 12433.

It is an arithmetic number, because the mean of its divisors is an integer number (3434211).

Almost surely, 2^64923136 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 64923136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68684220).

64923136 is an abundant number, since it is smaller than the sum of its proper divisors (72445304).

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

64923136 is an equidigital number, since it uses as much as digits as its factorization.

64923136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7494 (or 7478 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 64923136 is about 8057.4894353018. The cubic root of 64923136 is about 401.9140266466.

The spelling of 64923136 in words is "sixty-four million, nine hundred twenty-three thousand, one hundred thirty-six".