64397421 has 12 divisors (see below), whose sum is σ = 101474880. Its totient is φ = 39028680.

The previous prime is 64397419. The next prime is 64397477. The reversal of 64397421 is 12479346.

64397421 is a `hidden beast` number, since 643 + 9 + 7 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 64397421 - 2¹ = 64397419 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64397321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325141 + ... + 325338.

It is an arithmetic number, because the mean of its divisors is an integer number (8456240).

Almost surely, 2^64397421 is an apocalyptic number.

It is an amenable number.

64397421 is a deficient number, since it is larger than the sum of its proper divisors (37077459).

64397421 is a wasteful number, since it uses less digits than its factorization.

64397421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650496 (or 650493 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 64397421 is about 8024.8003713488. The cubic root of 64397421 is about 400.8262525085.

The spelling of 64397421 in words is "sixty-four million, three hundred ninety-seven thousand, four hundred twenty-one".