97991776 has 48 divisors (see below), whose sum is σ = 202583808. Its totient is φ = 46569600.

The previous prime is 97991767. The next prime is 97991801. The reversal of 97991776 is 67719979.

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, 154981 + ... + 155611.

It is an arithmetic number, because the mean of its divisors is an integer number (4220496).

Almost surely, 2^97991776 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 97991776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101291904).

97991776 is an abundant number, since it is smaller than the sum of its proper divisors (104592032).

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

97991776 is a wasteful number, since it uses less digits than its factorization.

97991776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 867 counting only the distinct ones).

The product of its digits is 1500282, while the sum is 55.

The square root of 97991776 is about 9899.0795531706. The cubic root of 97991776 is about 461.0307321689.

The spelling of 97991776 in words is "ninety-seven million, nine hundred ninety-one thousand, seven hundred seventy-six".