91772554433280 has 288 divisors, whose sum is σ = 335294822919168. Its totient is φ = 20956231680000.

The previous prime is 91772554433239. The next prime is 91772554433293. The reversal of 91772554433280 is 8233445527719.

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 31 ways as a sum of consecutive naturals, for example, 26057530 + ... + 29369030.

It is an arithmetic number, because the mean of its divisors is an integer number (1164218135136).

Almost surely, 2^{91772554433280} 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 91772554433280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167647411459584).

91772554433280 is an abundant number, since it is smaller than the sum of its proper divisors (243522268485888).

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

91772554433280 is a wasteful number, since it uses less digits than its factorization.

91772554433280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312563 (or 3312549 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 60.

The spelling of 91772554433280 in words is "ninety-one trillion, seven hundred seventy-two billion, five hundred fifty-four million, four hundred thirty-three thousand, two hundred eighty".