64356421 has 4 divisors (see below), whose sum is σ = 64396000. Its totient is φ = 64316844.

The previous prime is 64356377. The next prime is 64356449. The reversal of 64356421 is 12465346.

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.

It is a cyclic number.

It is not a de Polignac number, because 64356421 - 2⁷ = 64356293 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 (64356451) 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, 17241 + ... + 20638.

It is an arithmetic number, because the mean of its divisors is an integer number (16099000).

Almost surely, 2^64356421 is an apocalyptic number.

It is an amenable number.

64356421 is a deficient number, since it is larger than the sum of its proper divisors (39579).

64356421 is a wasteful number, since it uses less digits than its factorization.

64356421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39578.

The product of its digits is 17280, while the sum is 31.

The square root of 64356421 is about 8022.2453839309. The cubic root of 64356421 is about 400.7411695709.

The spelling of 64356421 in words is "sixty-four million, three hundred fifty-six thousand, four hundred twenty-one".