91637490 has 64 divisors (see below), whose sum is σ = 252149760. Its totient is φ = 20879040.

The previous prime is 91637479. The next prime is 91637503. The reversal of 91637490 is 9473619.

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, 100135 + ... + 101045.

It is an arithmetic number, because the mean of its divisors is an integer number (3939840).

Almost surely, 2^91637490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91637490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126074880).

91637490 is an abundant number, since it is smaller than the sum of its proper divisors (160512270).

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

91637490 is a wasteful number, since it uses less digits than its factorization.

91637490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 91637490 is about 9572.7472545764. The cubic root of 91637490 is about 450.8420283738.

It can be divided in two parts, 9163 and 7490, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 91637490 in words is "ninety-one million, six hundred thirty-seven thousand, four hundred ninety".