97155720 has 64 divisors (see below), whose sum is σ = 323856000. Its totient is φ = 25907904.

The previous prime is 97155689. The next prime is 97155727. The reversal of 97155720 is 2755179.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (97155727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43900 + ... + 46059.

It is an arithmetic number, because the mean of its divisors is an integer number (5060250).

Almost surely, 2^97155720 is an apocalyptic number.

97155720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

97155720 is an abundant number, since it is smaller than the sum of its proper divisors (226700280).

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

97155720 is a wasteful number, since it uses less digits than its factorization.

97155720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89979 (or 89969 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 97155720 is about 9856.7601167929. The cubic root of 97155720 is about 459.7158295274.

The spelling of 97155720 in words is "ninety-seven million, one hundred fifty-five thousand, seven hundred twenty".