64436904 has 128 divisors (see below), whose sum is σ = 215424000. Its totient is φ = 17433792.

The previous prime is 64436899. The next prime is 64436921. The reversal of 64436904 is 40963446.

64436904 is a `hidden beast` number, since 644 + 3 + 6 + 9 + 0 + 4 = 666.

It is a super-2 number, since 2×64436904² = 8304229194210432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27607 + ... + 29849.

It is an arithmetic number, because the mean of its divisors is an integer number (1683000).

Almost surely, 2^64436904 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 64436904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107712000).

64436904 is an abundant number, since it is smaller than the sum of its proper divisors (150987096).

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

64436904 is a wasteful number, since it uses less digits than its factorization.

64436904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 64436904 is about 8027.2600555856. The cubic root of 64436904 is about 400.9081532505.

The spelling of 64436904 in words is "sixty-four million, four hundred thirty-six thousand, nine hundred four".