91684572 has 48 divisors (see below), whose sum is σ = 247951872. Its totient is φ = 25824960.

The previous prime is 91684561. The next prime is 91684583. The reversal of 91684572 is 27548619.

It is an interprime number because it is at equal distance from previous prime (91684561) and next prime (91684583).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1723 + ... + 13650.

It is an arithmetic number, because the mean of its divisors is an integer number (5165664).

Almost surely, 2^91684572 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 91684572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123975936).

91684572 is an abundant number, since it is smaller than the sum of its proper divisors (156267300).

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

91684572 is a wasteful number, since it uses less digits than its factorization.

91684572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15458 (or 15456 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 91684572 is about 9575.2061074423. The cubic root of 91684572 is about 450.9192271641.

The spelling of 91684572 in words is "ninety-one million, six hundred eighty-four thousand, five hundred seventy-two".