97131356728 has 32 divisors (see below), whose sum is σ = 208282636800. Its totient is φ = 41598921312.

The previous prime is 97131356713. The next prime is 97131356731. The reversal of 97131356728 is 82765313179.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518308 + ... + 680371.

It is an arithmetic number, because the mean of its divisors is an integer number (6508832400).

Almost surely, 2^97131356728 is an apocalyptic number.

It is an amenable number.

97131356728 is an abundant number, since it is smaller than the sum of its proper divisors (111151280072).

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

97131356728 is a wasteful number, since it uses less digits than its factorization.

97131356728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200139 (or 1200135 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 52.

The spelling of 97131356728 in words is "ninety-seven billion, one hundred thirty-one million, three hundred fifty-six thousand, seven hundred twenty-eight".