91279088640 has 528 divisors, whose sum is σ = 335796757920. Its totient is φ = 22861578240.

The previous prime is 91279088611. The next prime is 91279088651. The reversal of 91279088640 is 4688097219.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119945860 + ... + 119946620.

Almost surely, 2^91279088640 is an apocalyptic number.

91279088640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91279088640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167898378960).

91279088640 is an abundant number, since it is smaller than the sum of its proper divisors (244517669280).

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

91279088640 is a wasteful number, since it uses less digits than its factorization.

91279088640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 91279088640 in words is "ninety-one billion, two hundred seventy-nine million, eighty-eight thousand, six hundred forty".