91720076 has 24 divisors (see below), whose sum is σ = 183800736. Its totient is φ = 39231360.

The previous prime is 91720073. The next prime is 91720091. The reversal of 91720076 is 67002719.

It is not an unprimeable number, because it can be changed into a prime (91720073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12656 + ... + 18536.

It is an arithmetic number, because the mean of its divisors is an integer number (7658364).

Almost surely, 2^91720076 is an apocalyptic number.

It is an amenable number.

91720076 is an abundant number, since it is smaller than the sum of its proper divisors (92080660).

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

91720076 is a wasteful number, since it uses less digits than its factorization.

91720076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6449 (or 6447 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 91720076 is about 9577.0598828659. The cubic root of 91720076 is about 450.9774244152.

The spelling of 91720076 in words is "ninety-one million, seven hundred twenty thousand, seventy-six".