91031396400 has 1260 divisors, whose sum is σ = 399461053392. Its totient is φ = 19830666240.

The previous prime is 91031396359. The next prime is 91031396437. The reversal of 91031396400 is 469313019.

91031396400 is a `hidden beast` number, since 9 + 1 + 0 + 3 + 1 + 3 + 9 + 640 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1260).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 328633062 + ... + 328633338.

Almost surely, 2^91031396400 is an apocalyptic number.

91031396400 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 91031396400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199730526696).

91031396400 is an abundant number, since it is smaller than the sum of its proper divisors (308429656992).

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

91031396400 is a wasteful number, since it uses less digits than its factorization.

91031396400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 91031396400 in words is "ninety-one billion, thirty-one million, three hundred ninety-six thousand, four hundred".