64899984 has 80 divisors (see below), whose sum is σ = 173238912. Its totient is φ = 20926464.

The previous prime is 64899979. The next prime is 64900009. The reversal of 64899984 is 48999846.

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, 246637 + ... + 246899.

Almost surely, 2^64899984 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 64899984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86619456).

64899984 is an abundant number, since it is smaller than the sum of its proper divisors (108338928).

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

64899984 is a wasteful number, since it uses less digits than its factorization.

64899984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 418 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The square root of 64899984 is about 8056.0526314070. The cubic root of 64899984 is about 401.8662459404.

The spelling of 64899984 in words is "sixty-four million, eight hundred ninety-nine thousand, nine hundred eighty-four".