91628008420 has 96 divisors (see below), whose sum is σ = 213000883200. Its totient is φ = 32889659904.

The previous prime is 91628008379. The next prime is 91628008481. The reversal of 91628008420 is 2480082619.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13839871 + ... + 13846489.

It is an arithmetic number, because the mean of its divisors is an integer number (2218759200).

Almost surely, 2^91628008420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91628008420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106500441600).

91628008420 is an abundant number, since it is smaller than the sum of its proper divisors (121372874780).

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

91628008420 is a wasteful number, since it uses less digits than its factorization.

91628008420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117 (or 8115 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 91628008420 in words is "ninety-one billion, six hundred twenty-eight million, eight thousand, four hundred twenty".