64536816 has 80 divisors (see below), whose sum is σ = 171489024. Its totient is φ = 20908032.

The previous prime is 64536809. The next prime is 64536877. The reversal of 64536816 is 61863546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386365 + ... + 386531.

Almost surely, 2^64536816 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 64536816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85744512).

64536816 is an abundant number, since it is smaller than the sum of its proper divisors (106952208).

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

64536816 is a wasteful number, since it uses less digits than its factorization.

64536816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 352 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 64536816 is about 8033.4809391695. The cubic root of 64536816 is about 401.1152542964.

The spelling of 64536816 in words is "sixty-four million, five hundred thirty-six thousand, eight hundred sixteen".