64997421 has 16 divisors (see below), whose sum is σ = 89676288. Its totient is φ = 41832000.

The previous prime is 64997407. The next prime is 64997441. The reversal of 64997421 is 12479946.

It is not a de Polignac number, because 64997421 - 2⁵ = 64997389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64997441) 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, 64695 + ... + 65691.

It is an arithmetic number, because the mean of its divisors is an integer number (5604768).

Almost surely, 2^64997421 is an apocalyptic number.

It is an amenable number.

64997421 is a deficient number, since it is larger than the sum of its proper divisors (24678867).

64997421 is a wasteful number, since it uses less digits than its factorization.

64997421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732.

The product of its digits is 108864, while the sum is 42.

The square root of 64997421 is about 8062.0978039218. The cubic root of 64997421 is about 402.0672581210.

The spelling of 64997421 in words is "sixty-four million, nine hundred ninety-seven thousand, four hundred twenty-one".