91201880 has 64 divisors (see below), whose sum is σ = 255847680. Its totient is φ = 28425600.

The previous prime is 91201879. The next prime is 91201883. The reversal of 91201880 is 8810219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91201883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11726 + ... + 17885.

It is an arithmetic number, because the mean of its divisors is an integer number (3997620).

Almost surely, 2^91201880 is an apocalyptic number.

It is an amenable number.

91201880 is an abundant number, since it is smaller than the sum of its proper divisors (164645800).

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

91201880 is a wasteful number, since it uses less digits than its factorization.

91201880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29640 (or 29636 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 91201880 is about 9549.9675392118. The cubic root of 91201880 is about 450.1265158675.

The spelling of 91201880 in words is "ninety-one million, two hundred one thousand, eight hundred eighty".