64623438 has 36 divisors (see below), whose sum is σ = 153908664. Its totient is φ = 19582200.

The previous prime is 64623431. The next prime is 64623509. The reversal of 64623438 is 83432646.

It is a happy number.

64623438 is a `hidden beast` number, since 646 + 2 + 3 + 4 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64623431) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12658 + ... + 17013.

Almost surely, 2^64623438 is an apocalyptic number.

64623438 is an abundant number, since it is smaller than the sum of its proper divisors (89285226).

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

64623438 is a wasteful number, since it uses less digits than its factorization.

64623438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29701 (or 29687 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 64623438 is about 8038.8704430411. The cubic root of 64623438 is about 401.2946344501.

The spelling of 64623438 in words is "sixty-four million, six hundred twenty-three thousand, four hundred thirty-eight".