64621257 has 8 divisors (see below), whose sum is σ = 87787584. Its totient is φ = 42267888.

The previous prime is 64621253. The next prime is 64621307. The reversal of 64621257 is 75212646.

64621257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64621257 - 2² = 64621253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64621253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203053 + ... + 203370.

It is an arithmetic number, because the mean of its divisors is an integer number (10973448).

Almost surely, 2^64621257 is an apocalyptic number.

It is an amenable number.

64621257 is a deficient number, since it is larger than the sum of its proper divisors (23166327).

64621257 is a wasteful number, since it uses less digits than its factorization.

64621257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406479.

The product of its digits is 20160, while the sum is 33.

The square root of 64621257 is about 8038.7347885099. The cubic root of 64621257 is about 401.2901199196.

The spelling of 64621257 in words is "sixty-four million, six hundred twenty-one thousand, two hundred fifty-seven".