91019418672 has 320 divisors, whose sum is σ = 297964929024. Its totient is φ = 23302702080.

The previous prime is 91019418631. The next prime is 91019418691. The reversal of 91019418672 is 27681491019.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 26070847 + ... + 26074337.

Almost surely, 2^91019418672 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 91019418672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148982464512).

91019418672 is an abundant number, since it is smaller than the sum of its proper divisors (206945510352).

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

91019418672 is a wasteful number, since it uses less digits than its factorization.

91019418672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3690 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 91019418672 in words is "ninety-one billion, nineteen million, four hundred eighteen thousand, six hundred seventy-two".