64405556 has 12 divisors (see below), whose sum is σ = 113031492. Its totient is φ = 32110848.

The previous prime is 64405541. The next prime is 64405603. The reversal of 64405556 is 65550446.

It can be written as a sum of positive squares in 2 ways, for example, as 11115556 + 53290000 = 3334^2 + 7300^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21395 + ... + 24218.

It is an arithmetic number, because the mean of its divisors is an integer number (9419291).

Almost surely, 2^64405556 is an apocalyptic number.

It is an amenable number.

64405556 is a deficient number, since it is larger than the sum of its proper divisors (48625936).

64405556 is a wasteful number, since it uses less digits than its factorization.

64405556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45970 (or 45968 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 64405556 is about 8025.3072215336. The cubic root of 64405556 is about 400.8431299145.

The spelling of 64405556 in words is "sixty-four million, four hundred five thousand, five hundred fifty-six".