91790642 has 8 divisors (see below), whose sum is σ = 137779500. Its totient is φ = 45864144.

The previous prime is 91790641. The next prime is 91790669. The reversal of 91790642 is 24609719.

It can be written as a sum of positive squares in 2 ways, for example, as 89661961 + 2128681 = 9469^2 + 1459^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 91790596 and 91790605.

It is not an unprimeable number, because it can be changed into a prime (91790641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11717 + ... + 17912.

Almost surely, 2^91790642 is an apocalyptic number.

91790642 is a deficient number, since it is larger than the sum of its proper divisors (45988858).

91790642 is a wasteful number, since it uses less digits than its factorization.

91790642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31180.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 91790642 is about 9580.7432905803. The cubic root of 91790642 is about 451.0930498286.

The spelling of 91790642 in words is "ninety-one million, seven hundred ninety thousand, six hundred forty-two".