64457736 has 96 divisors (see below), whose sum is σ = 190836000. Its totient is φ = 18084864.

The previous prime is 64457719. The next prime is 64457779. The reversal of 64457736 is 63775446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68920 + ... + 69848.

It is an arithmetic number, because the mean of its divisors is an integer number (1987875).

Almost surely, 2^64457736 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 64457736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95418000).

64457736 is an abundant number, since it is smaller than the sum of its proper divisors (126378264).

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

64457736 is a wasteful number, since it uses less digits than its factorization.

64457736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011 (or 1000 counting only the distinct ones).

The product of its digits is 423360, while the sum is 42.

The square root of 64457736 is about 8028.5575292203. The cubic root of 64457736 is about 400.9513521953.

The spelling of 64457736 in words is "sixty-four million, four hundred fifty-seven thousand, seven hundred thirty-six".