97831880 has 64 divisors (see below), whose sum is σ = 235128960. Its totient is φ = 36546048.

The previous prime is 97831879. The next prime is 97831883. The reversal of 97831880 is 8813879.

It is a Cunningham number, because it is equal to 9891²-1.

It is not an unprimeable number, because it can be changed into a prime (97831883) 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, 38324 + ... + 40796.

It is an arithmetic number, because the mean of its divisors is an integer number (3673890).

Almost surely, 2^97831880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97831880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117564480).

97831880 is an abundant number, since it is smaller than the sum of its proper divisors (137297080).

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

97831880 is a wasteful number, since it uses less digits than its factorization.

97831880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2546 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 97831880 is about 9890.9999494490. Note that the first 4 decimals coincide. The cubic root of 97831880 is about 460.7798366185.

The spelling of 97831880 in words is "ninety-seven million, eight hundred thirty-one thousand, eight hundred eighty".