64402664 has 16 divisors (see below), whose sum is σ = 127858500. Its totient is φ = 30307072.

The previous prime is 64402661. The next prime is 64402687. The reversal of 64402664 is 46620446.

It can be written as a sum of positive squares in 2 ways, for example, as 58400164 + 6002500 = 7642^2 + 2450^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64402664.

It is not an unprimeable number, because it can be changed into a prime (64402661) 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, 236639 + ... + 236910.

Almost surely, 2^64402664 is an apocalyptic number.

It is an amenable number.

64402664 is a deficient number, since it is larger than the sum of its proper divisors (63455836).

64402664 is a wasteful number, since it uses less digits than its factorization.

64402664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473572 (or 473568 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 64402664 is about 8025.1270394929. The cubic root of 64402664 is about 400.8371301440.

The spelling of 64402664 in words is "sixty-four million, four hundred two thousand, six hundred sixty-four".