91978429340 has 24 divisors (see below), whose sum is σ = 220748230752. Its totient is φ = 31535461440.

The previous prime is 91978429307. The next prime is 91978429351. The reversal of 91978429340 is 4392487919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328494251 + ... + 328494530.

It is an arithmetic number, because the mean of its divisors is an integer number (9197842948).

Almost surely, 2^91978429340 is an apocalyptic number.

It is an amenable number.

91978429340 is an abundant number, since it is smaller than the sum of its proper divisors (128769801412).

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

91978429340 is a wasteful number, since it uses less digits than its factorization.

91978429340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656988797 (or 656988795 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 91978429340 in words is "ninety-one billion, nine hundred seventy-eight million, four hundred twenty-nine thousand, three hundred forty".