64435856 has 40 divisors (see below), whose sum is σ = 129825024. Its totient is φ = 30948480.

The previous prime is 64435853. The next prime is 64435867. The reversal of 64435856 is 65853446.

It is not an unprimeable number, because it can be changed into a prime (64435853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80450 + ... + 81246.

Almost surely, 2^64435856 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 64435856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64912512).

64435856 is an abundant number, since it is smaller than the sum of its proper divisors (65389168).

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

64435856 is a wasteful number, since it uses less digits than its factorization.

64435856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 993 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 64435856 is about 8027.1947777539. The cubic root of 64435856 is about 400.9059797857.

The spelling of 64435856 in words is "sixty-four million, four hundred thirty-five thousand, eight hundred fifty-six".