64915380 has 72 divisors (see below), whose sum is σ = 201513312. Its totient is φ = 16906176.

The previous prime is 64915321. The next prime is 64915391. The reversal of 64915380 is 8351946.

64915380 is a `hidden beast` number, since 649 + 1 + 5 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3547 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (2798796).

Almost surely, 2^64915380 is an apocalyptic number.

64915380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64915380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100756656).

64915380 is an abundant number, since it is smaller than the sum of its proper divisors (136597932).

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

64915380 is a wasteful number, since it uses less digits than its factorization.

64915380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8445 (or 8440 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 64915380 is about 8057.0081295727. The cubic root of 64915380 is about 401.8980212104.

The spelling of 64915380 in words is "sixty-four million, nine hundred fifteen thousand, three hundred eighty".