97991830 has 8 divisors (see below), whose sum is σ = 176385312. Its totient is φ = 39196728.

The previous prime is 97991821. The next prime is 97991843. The reversal of 97991830 is 3819979.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4899582 + ... + 4899601.

It is an arithmetic number, because the mean of its divisors is an integer number (22048164).

Almost surely, 2^97991830 is an apocalyptic number.

97991830 is a deficient number, since it is larger than the sum of its proper divisors (78393482).

97991830 is a wasteful number, since it uses less digits than its factorization.

97991830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9799190.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 97991830 is about 9899.0822806965. The cubic root of 97991830 is about 461.0308168551.

The spelling of 97991830 in words is "ninety-seven million, nine hundred ninety-one thousand, eight hundred thirty".