91890279972480 has 1024 divisors, whose sum is σ = 330544128983040. Its totient is φ = 21522524160000.

The previous prime is 91890279972479. The next prime is 91890279972487. The reversal of 91890279972480 is 8427997209819.

It is not an unprimeable number, because it can be changed into a prime (91890279972487) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 25031401045 + ... + 25031404715.

It is an arithmetic number, because the mean of its divisors is an integer number (322797000960).

Almost surely, 2^{91890279972480} 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 91890279972480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165272064491520).

91890279972480 is an abundant number, since it is smaller than the sum of its proper divisors (238653849010560).

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

91890279972480 is a wasteful number, since it uses less digits than its factorization.

91890279972480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069 (or 4057 counting only the distinct ones).

The product of its (nonzero) digits is 329204736, while the sum is 75.

The spelling of 91890279972480 in words is "ninety-one trillion, eight hundred ninety billion, two hundred seventy-nine million, nine hundred seventy-two thousand, four hundred eighty".