64136555 has 16 divisors (see below), whose sum is σ = 88817664. Its totient is φ = 43549920.

The previous prime is 64136543. The next prime is 64136557. The reversal of 64136555 is 55563146.

It is not a de Polignac number, because 64136555 - 2⁴ = 64136539 is a prime.

It is a super-2 number, since 2×64136555² = 8226995374536050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64136557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5291 + ... + 12500.

It is an arithmetic number, because the mean of its divisors is an integer number (5551104).

Almost surely, 2^64136555 is an apocalyptic number.

64136555 is a deficient number, since it is larger than the sum of its proper divisors (24681109).

64136555 is a wasteful number, since it uses less digits than its factorization.

64136555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17906.

The product of its digits is 54000, while the sum is 35.

The square root of 64136555 is about 8008.5301397947. The cubic root of 64136555 is about 400.2842874870.

The spelling of 64136555 in words is "sixty-four million, one hundred thirty-six thousand, five hundred fifty-five".