64671556 has 12 divisors (see below), whose sum is σ = 114040080. Its totient is φ = 32088680.

The previous prime is 64671547. The next prime is 64671559. The reversal of 64671556 is 65517646.

It is a super-2 number, since 2×64671556² = 8364820310922272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64671559) 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, 61186 + ... + 62233.

It is an arithmetic number, because the mean of its divisors is an integer number (9503340).

Almost surely, 2^64671556 is an apocalyptic number.

It is an amenable number.

64671556 is a deficient number, since it is larger than the sum of its proper divisors (49368524).

64671556 is a wasteful number, since it uses less digits than its factorization.

64671556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123554 (or 123552 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 64671556 is about 8041.8627195445. The cubic root of 64671556 is about 401.3942098015.

The spelling of 64671556 in words is "sixty-four million, six hundred seventy-one thousand, five hundred fifty-six".