91980856 has 16 divisors (see below), whose sum is σ = 188142840. Its totient is φ = 41809440.

The previous prime is 91980851. The next prime is 91980871. The reversal of 91980856 is 65808919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91980851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522531 + ... + 522706.

Almost surely, 2^91980856 is an apocalyptic number.

It is an amenable number.

91980856 is an abundant number, since it is smaller than the sum of its proper divisors (96161984).

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

91980856 is a wasteful number, since it uses less digits than its factorization.

91980856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045254 (or 1045250 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 91980856 is about 9590.6650447193. The cubic root of 91980856 is about 451.4044287453.

The spelling of 91980856 in words is "ninety-one million, nine hundred eighty thousand, eight hundred fifty-six".