97156820 has 24 divisors (see below), whose sum is σ = 209545224. Its totient is φ = 37812096.

The previous prime is 97156811. The next prime is 97156837. The reversal of 97156820 is 2865179.

It can be written as a sum of positive squares in 4 ways, for example, as 47087044 + 50069776 = 6862^2 + 7076^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 64907 + ... + 66386.

It is an arithmetic number, because the mean of its divisors is an integer number (8731051).

Almost surely, 2^97156820 is an apocalyptic number.

It is an amenable number.

97156820 is an abundant number, since it is smaller than the sum of its proper divisors (112388404).

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

97156820 is a wasteful number, since it uses less digits than its factorization.

97156820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131339 (or 131337 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 97156820 is about 9856.8159159031. The cubic root of 97156820 is about 459.7175644930.

The spelling of 97156820 in words is "ninety-seven million, one hundred fifty-six thousand, eight hundred twenty".