64421694 has 24 divisors (see below), whose sum is σ = 139793472. Its totient is φ = 21441120.

The previous prime is 64421683. The next prime is 64421711. The reversal of 64421694 is 49612446.

64421694 is a `hidden beast` number, since 644 + 2 + 1 + 6 + 9 + 4 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11347 + ... + 16049.

It is an arithmetic number, because the mean of its divisors is an integer number (5824728).

Almost surely, 2^64421694 is an apocalyptic number.

64421694 is an abundant number, since it is smaller than the sum of its proper divisors (75371778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64421694 is a wasteful number, since it uses less digits than its factorization.

64421694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472 (or 5469 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 64421694 is about 8026.3126029329. The cubic root of 64421694 is about 400.8766066652.

The spelling of 64421694 in words is "sixty-four million, four hundred twenty-one thousand, six hundred ninety-four".