64915984 has 60 divisors (see below), whose sum is σ = 151085568. Its totient is φ = 26913600.

The previous prime is 64915909. The next prime is 64915987. The reversal of 64915984 is 48951946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64915987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22969 + ... + 25639.

Almost surely, 2^64915984 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 64915984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75542784).

64915984 is an abundant number, since it is smaller than the sum of its proper divisors (86169584).

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

64915984 is a wasteful number, since it uses less digits than its factorization.

64915984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724 (or 2711 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 64915984 is about 8057.0456123817. The cubic root of 64915984 is about 401.8992676826.

The spelling of 64915984 in words is "sixty-four million, nine hundred fifteen thousand, nine hundred eighty-four".