64397555 has 16 divisors (see below), whose sum is σ = 81557280. Its totient is φ = 48678912.

The previous prime is 64397521. The next prime is 64397563. The reversal of 64397555 is 55579346.

It is not a de Polignac number, because 64397555 - 2¹⁰ = 64396531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52307 + ... + 53523.

It is an arithmetic number, because the mean of its divisors is an integer number (5097330).

Almost surely, 2^64397555 is an apocalyptic number.

64397555 is a deficient number, since it is larger than the sum of its proper divisors (17159725).

64397555 is a wasteful number, since it uses less digits than its factorization.

64397555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798.

The product of its digits is 567000, while the sum is 44.

The square root of 64397555 is about 8024.8087204618. The cubic root of 64397555 is about 400.8265305252.

The spelling of 64397555 in words is "sixty-four million, three hundred ninety-seven thousand, five hundred fifty-five".