97991370 has 40 divisors (see below), whose sum is σ = 263490084. Its totient is φ = 26130816.

The previous prime is 97991359. The next prime is 97991407. The reversal of 97991370 is 7319979.

It can be written as a sum of positive squares in 2 ways, for example, as 94653441 + 3337929 = 9729^2 + 1827^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59679 + ... + 61298.

Almost surely, 2^97991370 is an apocalyptic number.

97991370 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

97991370 is an abundant number, since it is smaller than the sum of its proper divisors (165498714).

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

97991370 is a wasteful number, since it uses less digits than its factorization.

97991370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120996 (or 120987 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 97991370 is about 9899.0590461922. The cubic root of 97991370 is about 461.0300954531.

The spelling of 97991370 in words is "ninety-seven million, nine hundred ninety-one thousand, three hundred seventy".