91208678400 has 792 divisors, whose sum is σ = 389773200240. Its totient is φ = 20839956480.

The previous prime is 91208678359. The next prime is 91208678437. The reversal of 91208678400 is 487680219.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 33867454 + ... + 33870146.

Almost surely, 2^91208678400 is an apocalyptic number.

91208678400 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 91208678400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194886600120).

91208678400 is an abundant number, since it is smaller than the sum of its proper divisors (298564521840).

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

91208678400 is a wasteful number, since it uses less digits than its factorization.

91208678400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2710 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 91208678400 in words is "ninety-one billion, two hundred eight million, six hundred seventy-eight thousand, four hundred".