91977534 has 48 divisors (see below), whose sum is σ = 219688560. Its totient is φ = 27578880.

The previous prime is 91977517. The next prime is 91977563. The reversal of 91977534 is 43577919.

It is a self number, because there is not a number n which added to its sum of digits gives 91977534.

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 23 ways as a sum of consecutive naturals, for example, 16812 + ... + 21600.

It is an arithmetic number, because the mean of its divisors is an integer number (4576845).

Almost surely, 2^91977534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91977534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109844280).

91977534 is an abundant number, since it is smaller than the sum of its proper divisors (127711026).

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

91977534 is a wasteful number, since it uses less digits than its factorization.

91977534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905 (or 4902 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 91977534 is about 9590.4918539145. The cubic root of 91977534 is about 451.3989943406.

The spelling of 91977534 in words is "ninety-one million, nine hundred seventy-seven thousand, five hundred thirty-four".