91720422 has 48 divisors (see below), whose sum is σ = 205208640. Its totient is φ = 29592576.

The previous prime is 91720411. The next prime is 91720439. The reversal of 91720422 is 22402719.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74758 + ... + 75974.

It is an arithmetic number, because the mean of its divisors is an integer number (4275180).

Almost surely, 2^91720422 is an apocalyptic number.

91720422 is an abundant number, since it is smaller than the sum of its proper divisors (113488218).

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

91720422 is a wasteful number, since it uses less digits than its factorization.

91720422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 91720422 is about 9577.0779468479. The cubic root of 91720422 is about 450.9779914957.

The spelling of 91720422 in words is "ninety-one million, seven hundred twenty thousand, four hundred twenty-two".