64640884 has 48 divisors (see below), whose sum is σ = 145918080. Its totient is φ = 24312960.

The previous prime is 64640861. The next prime is 64640923. The reversal of 64640884 is 48804646.

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, 5314 + ... + 12550.

It is an arithmetic number, because the mean of its divisors is an integer number (3039960).

Almost surely, 2^64640884 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 64640884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72959040).

64640884 is an abundant number, since it is smaller than the sum of its proper divisors (81277196).

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

64640884 is a wasteful number, since it uses less digits than its factorization.

64640884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7288 (or 7286 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 64640884 is about 8039.9554725135. The cubic root of 64640884 is about 401.3307428988.

The spelling of 64640884 in words is "sixty-four million, six hundred forty thousand, eight hundred eighty-four".