64155321 has 10 divisors (see below), whose sum is σ = 95837082. Its totient is φ = 42770160.

The previous prime is 64155317. The next prime is 64155341. The reversal of 64155321 is 12355146.

It can be written as a sum of positive squares in only one way, i.e., 59907600 + 4247721 = 7740^2 + 2061^2 .

It is not a de Polignac number, because 64155321 - 2² = 64155317 is a prime.

It is a super-2 number, since 2×64155321² = 8231810425226082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (64155341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 395940 + ... + 396101.

Almost surely, 2^64155321 is an apocalyptic number.

It is an amenable number.

64155321 is a deficient number, since it is larger than the sum of its proper divisors (31681761).

64155321 is an equidigital number, since it uses as much as digits as its factorization.

64155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792053 (or 792044 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 64155321 is about 8009.7016798380. The cubic root of 64155321 is about 400.3233240002.

The spelling of 64155321 in words is "sixty-four million, one hundred fifty-five thousand, three hundred twenty-one".