91877240 has 128 divisors (see below), whose sum is σ = 260789760. Its totient is φ = 28353024.

The previous prime is 91877239. The next prime is 91877263. The reversal of 91877240 is 4277819.

It is a junction number, because it is equal to n+sod(n) for n = 91877194 and 91877203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156227 + ... + 156813.

It is an arithmetic number, because the mean of its divisors is an integer number (2037420).

Almost surely, 2^91877240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91877240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130394880).

91877240 is an abundant number, since it is smaller than the sum of its proper divisors (168912520).

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

91877240 is a wasteful number, since it uses less digits than its factorization.

91877240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 91877240 is about 9585.2616031071. The cubic root of 91877240 is about 451.2348634052.

The spelling of 91877240 in words is "ninety-one million, eight hundred seventy-seven thousand, two hundred forty".