97189890 has 128 divisors (see below), whose sum is σ = 279797760. Its totient is φ = 21143808.

The previous prime is 97189889. The next prime is 97189903. The reversal of 97189890 is 9898179.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 424296 + ... + 424524.

It is an arithmetic number, because the mean of its divisors is an integer number (2185920).

Almost surely, 2^97189890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97189890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139898880).

97189890 is an abundant number, since it is smaller than the sum of its proper divisors (182607870).

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

97189890 is a wasteful number, since it uses less digits than its factorization.

97189890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 97189890 is about 9858.4932925879. The cubic root of 97189890 is about 459.7697177551.

The spelling of 97189890 in words is "ninety-seven million, one hundred eighty-nine thousand, eight hundred ninety".