438688656 has 80 divisors (see below), whose sum is σ = 1439094400. Its totient is φ = 125338752.

The previous prime is 438688633. The next prime is 438688667. The reversal of 438688656 is 656886834.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69511 + ... + 75558.

It is an arithmetic number, because the mean of its divisors is an integer number (17988680).

Almost surely, 2^438688656 is an apocalyptic number.

It is an amenable number.

438688656 is an abundant number, since it is smaller than the sum of its proper divisors (1000405744).

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

438688656 is a wasteful number, since it uses less digits than its factorization.

438688656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145093 (or 145081 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The square root of 438688656 is about 20944.8957027721. The cubic root of 438688656 is about 759.8341373966.

The spelling of 438688656 in words is "four hundred thirty-eight million, six hundred eighty-eight thousand, six hundred fifty-six".