64987760 has 20 divisors (see below), whose sum is σ = 151096728. Its totient is φ = 25995072.

The previous prime is 64987759. The next prime is 64987777. The reversal of 64987760 is 6778946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406094 + ... + 406253.

Almost surely, 2^64987760 is an apocalyptic number.

It is an amenable number.

64987760 is an abundant number, since it is smaller than the sum of its proper divisors (86108968).

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

64987760 is a wasteful number, since it uses less digits than its factorization.

64987760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812360 (or 812354 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 64987760 is about 8061.4986199838. The cubic root of 64987760 is about 402.0473364883.

The spelling of 64987760 in words is "sixty-four million, nine hundred eighty-seven thousand, seven hundred sixty".