64723998 has 32 divisors (see below), whose sum is σ = 141795360. Its totient is φ = 19604480.

The previous prime is 64723991. The next prime is 64723999. The reversal of 64723998 is 89932746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723991) 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, 7983 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (4431105).

Almost surely, 2^64723998 is an apocalyptic number.

64723998 is an abundant number, since it is smaller than the sum of its proper divisors (77071362).

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

64723998 is a wasteful number, since it uses less digits than its factorization.

64723998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21932.

The product of its digits is 653184, while the sum is 48.

The square root of 64723998 is about 8045.1226218125. The cubic root of 64723998 is about 401.5026770023.

The spelling of 64723998 in words is "sixty-four million, seven hundred twenty-three thousand, nine hundred ninety-eight".