97090728 has 64 divisors (see below), whose sum is σ = 289474560. Its totient is φ = 26533056.

The previous prime is 97090727. The next prime is 97090739. The reversal of 97090728 is 82709079.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 97090728.

It is not an unprimeable number, because it can be changed into a prime (97090727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8700 + ... + 16427.

It is an arithmetic number, because the mean of its divisors is an integer number (4523040).

Almost surely, 2^97090728 is an apocalyptic number.

It is an amenable number.

97090728 is an abundant number, since it is smaller than the sum of its proper divisors (192383832).

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

97090728 is a wasteful number, since it uses less digits than its factorization.

97090728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25166 (or 25162 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 97090728 is about 9853.4627415950. The cubic root of 97090728 is about 459.6132981963.

The spelling of 97090728 in words is "ninety-seven million, ninety thousand, seven hundred twenty-eight".