91988544 has 56 divisors (see below), whose sum is σ = 244823488. Its totient is φ = 30481920.

The previous prime is 91988537. The next prime is 91988573. The reversal of 91988544 is 44588919.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 91988493 and 91988502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33429 + ... + 36075.

It is an arithmetic number, because the mean of its divisors is an integer number (4371848).

Almost surely, 2^91988544 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 91988544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122411744).

91988544 is an abundant number, since it is smaller than the sum of its proper divisors (152834944).

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

91988544 is a wasteful number, since it uses less digits than its factorization.

91988544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843 (or 2833 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 91988544 is about 9591.0658427518. The cubic root of 91988544 is about 451.4170049150.

The spelling of 91988544 in words is "ninety-one million, nine hundred eighty-eight thousand, five hundred forty-four".