91620620 has 48 divisors (see below), whose sum is σ = 236808768. Its totient is φ = 28995840.

The previous prime is 91620589. The next prime is 91620637. The reversal of 91620620 is 2602619.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 91620620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23351 + ... + 26990.

It is an arithmetic number, because the mean of its divisors is an integer number (4933516).

Almost surely, 2^91620620 is an apocalyptic number.

It is an amenable number.

91620620 is an abundant number, since it is smaller than the sum of its proper divisors (145188148).

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

91620620 is a wasteful number, since it uses less digits than its factorization.

91620620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50370 (or 50368 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 91620620 is about 9571.8660667604. The cubic root of 91620620 is about 450.8143607609.

The spelling of 91620620 in words is "ninety-one million, six hundred twenty thousand, six hundred twenty".