91974409408 has 28 divisors (see below), whose sum is σ = 208584822352. Its totient is φ = 39417603840.

The previous prime is 91974409381. The next prime is 91974409427. The reversal of 91974409408 is 80490447919.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102649563 + ... + 102650458.

Almost surely, 2^91974409408 is an apocalyptic number.

It is an amenable number.

91974409408 is an abundant number, since it is smaller than the sum of its proper divisors (116610412944).

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

91974409408 is a wasteful number, since it uses less digits than its factorization.

91974409408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205300040 (or 205300030 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 91974409408 in words is "ninety-one billion, nine hundred seventy-four million, four hundred nine thousand, four hundred eight".