91877940 has 216 divisors, whose sum is σ = 354043872. Its totient is φ = 19071360.

The previous prime is 91877923. The next prime is 91877959. The reversal of 91877940 is 4977819.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 96547 + ... + 97493.

It is an arithmetic number, because the mean of its divisors is an integer number (1639092).

Almost surely, 2^91877940 is an apocalyptic number.

91877940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91877940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177021936).

91877940 is an abundant number, since it is smaller than the sum of its proper divisors (262165932).

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

91877940 is a wasteful number, since it uses less digits than its factorization.

91877940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 91877940 is about 9585.2981174296. The cubic root of 91877940 is about 451.2360093677.

It can be divided in two parts, 918779 and 40, that added together give a palindrome (918819).

The spelling of 91877940 in words is "ninety-one million, eight hundred seventy-seven thousand, nine hundred forty".