91519679940 has 192 divisors, whose sum is σ = 299863818240. Its totient is φ = 20653678080.

The previous prime is 91519679893. The next prime is 91519679963. The reversal of 91519679940 is 4997691519.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 359817 + ... + 559023.

It is an arithmetic number, because the mean of its divisors is an integer number (1561790720).

Almost surely, 2^91519679940 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 91519679940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149931909120).

91519679940 is an abundant number, since it is smaller than the sum of its proper divisors (208344138300).

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

91519679940 is a wasteful number, since it uses less digits than its factorization.

91519679940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199282 (or 199280 counting only the distinct ones).

The product of its (nonzero) digits is 5511240, while the sum is 60.

The spelling of 91519679940 in words is "ninety-one billion, five hundred nineteen million, six hundred seventy-nine thousand, nine hundred forty".