80891532 has 36 divisors (see below), whose sum is σ = 205634520. Its totient is φ = 26811072.

The previous prime is 80891453. The next prime is 80891533. The reversal of 80891532 is 23519808.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (80891533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168 + ... + 12720.

It is an arithmetic number, because the mean of its divisors is an integer number (5712070).

Almost surely, 2^80891532 is an apocalyptic number.

It is an amenable number.

80891532 is an abundant number, since it is smaller than the sum of its proper divisors (124742988).

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

80891532 is a wasteful number, since it uses less digits than its factorization.

80891532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12742 (or 12737 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 80891532 is about 8993.9719812772. The cubic root of 80891532 is about 432.4816515766.

The spelling of 80891532 in words is "eighty million, eight hundred ninety-one thousand, five hundred thirty-two".