91820472 has 16 divisors (see below), whose sum is σ = 229551240. Its totient is φ = 30606816.

The previous prime is 91820459. The next prime is 91820489. The reversal of 91820472 is 27402819.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1912903 + ... + 1912950.

Almost surely, 2^91820472 is an apocalyptic number.

It is an amenable number.

91820472 is an abundant number, since it is smaller than the sum of its proper divisors (137730768).

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

91820472 is a wasteful number, since it uses less digits than its factorization.

91820472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825862 (or 3825858 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 91820472 is about 9582.2999326884. The cubic root of 91820472 is about 451.1419097414.

The spelling of 91820472 in words is "ninety-one million, eight hundred twenty thousand, four hundred seventy-two".