69131728 has 20 divisors (see below), whose sum is σ = 140992960. Its totient is φ = 32746464.

The previous prime is 69131719. The next prime is 69131743. The reversal of 69131728 is 82713196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113400 + ... + 114007.

It is an arithmetic number, because the mean of its divisors is an integer number (7049648).

Almost surely, 2^69131728 is an apocalyptic number.

It is an amenable number.

69131728 is an abundant number, since it is smaller than the sum of its proper divisors (71861232).

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

69131728 is a wasteful number, since it uses less digits than its factorization.

69131728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227434 (or 227428 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 69131728 is about 8314.5491759926. The cubic root of 69131728 is about 410.4174372299.

The spelling of 69131728 in words is "sixty-nine million, one hundred thirty-one thousand, seven hundred twenty-eight".