64930880 has 168 divisors, whose sum is σ = 186071256. Its totient is φ = 21504000.

The previous prime is 64930867. The next prime is 64930897. The reversal of 64930880 is 8803946.

It can be written as a sum of positive squares in 4 ways, for example, as 6927424 + 58003456 = 2632^2 + 7616^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 642830 + ... + 642930.

It is an arithmetic number, because the mean of its divisors is an integer number (1107567).

Almost surely, 2^64930880 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 64930880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93035628).

64930880 is an abundant number, since it is smaller than the sum of its proper divisors (121140376).

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

64930880 is a wasteful number, since it uses less digits than its factorization.

64930880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 64930880 is about 8057.9699676780. The cubic root of 64930880 is about 401.9300060476.

The spelling of 64930880 in words is "sixty-four million, nine hundred thirty thousand, eight hundred eighty".