97788990 has 32 divisors (see below), whose sum is σ = 252747936. Its totient is φ = 24071040.

The previous prime is 97788989. The next prime is 97788997. The reversal of 97788990 is 9988779.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97788990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97788997) 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, 124981 + ... + 125760.

It is an arithmetic number, because the mean of its divisors is an integer number (7898373).

Almost surely, 2^97788990 is an apocalyptic number.

97788990 is an abundant number, since it is smaller than the sum of its proper divisors (154958946).

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

97788990 is a wasteful number, since it uses less digits than its factorization.

97788990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250764.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 97788990 is about 9888.8315791098. The cubic root of 97788990 is about 460.7124906915.

The spelling of 97788990 in words is "ninety-seven million, seven hundred eighty-eight thousand, nine hundred ninety".