64379621 has 4 divisors (see below), whose sum is σ = 64774752. Its totient is φ = 63984492.

The previous prime is 64379617. The next prime is 64379633. The reversal of 64379621 is 12697346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12697346 = 2 ⋅6348673.

It is a cyclic number.

It is not a de Polignac number, because 64379621 - 2² = 64379617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64379611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197321 + ... + 197646.

It is an arithmetic number, because the mean of its divisors is an integer number (16193688).

Almost surely, 2^64379621 is an apocalyptic number.

It is an amenable number.

64379621 is a deficient number, since it is larger than the sum of its proper divisors (395131).

64379621 is a wasteful number, since it uses less digits than its factorization.

64379621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395130.

The product of its digits is 54432, while the sum is 38.

The square root of 64379621 is about 8023.6912328429. The cubic root of 64379621 is about 400.7893184996.

The spelling of 64379621 in words is "sixty-four million, three hundred seventy-nine thousand, six hundred twenty-one".