64779580 has 12 divisors (see below), whose sum is σ = 136037160. Its totient is φ = 25911824.

The previous prime is 64779557. The next prime is 64779587. The reversal of 64779580 is 8597746.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64779580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64779587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619470 + ... + 1619509.

It is an arithmetic number, because the mean of its divisors is an integer number (11336430).

Almost surely, 2^64779580 is an apocalyptic number.

It is an amenable number.

64779580 is an abundant number, since it is smaller than the sum of its proper divisors (71257580).

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

64779580 is a wasteful number, since it uses less digits than its factorization.

64779580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238988 (or 3238986 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 64779580 is about 8048.5762716148. The cubic root of 64779580 is about 401.6175748117.

The spelling of 64779580 in words is "sixty-four million, seven hundred seventy-nine thousand, five hundred eighty".