91579620 has 192 divisors, whose sum is σ = 301593600. Its totient is φ = 20528640.

The previous prime is 91579613. The next prime is 91579661. The reversal of 91579620 is 2697519.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 840126 + ... + 840234.

It is an arithmetic number, because the mean of its divisors is an integer number (1570800).

Almost surely, 2^91579620 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 91579620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150796800).

91579620 is an abundant number, since it is smaller than the sum of its proper divisors (210013980).

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

91579620 is a wasteful number, since it uses less digits than its factorization.

91579620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 91579620 is about 9569.7241339550. The cubic root of 91579620 is about 450.7471046252.

The spelling of 91579620 in words is "ninety-one million, five hundred seventy-nine thousand, six hundred twenty".