64621329 has 16 divisors (see below), whose sum is σ = 92811264. Its totient is φ = 39877200.

The previous prime is 64621321. The next prime is 64621331. The reversal of 64621329 is 92312646.

It is not a de Polignac number, because 64621329 - 2³ = 64621321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64621329.

It is not an unprimeable number, because it can be changed into a prime (64621321) 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, 12967 + ... + 17244.

It is an arithmetic number, because the mean of its divisors is an integer number (5800704).

Almost surely, 2^64621329 is an apocalyptic number.

64621329 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

64621329 is a deficient number, since it is larger than the sum of its proper divisors (28189935).

64621329 is a wasteful number, since it uses less digits than its factorization.

64621329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30268.

The product of its digits is 15552, while the sum is 33.

The square root of 64621329 is about 8038.7392668254. The cubic root of 64621329 is about 401.2902689566.

The spelling of 64621329 in words is "sixty-four million, six hundred twenty-one thousand, three hundred twenty-nine".