80931540 has 96 divisors (see below), whose sum is σ = 234710784. Its totient is φ = 20823040.

The previous prime is 80931533. The next prime is 80931553. The reversal of 80931540 is 4513908.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 80931498 and 80931507.

It is a congruent number.

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, 410722 + ... + 410918.

It is an arithmetic number, because the mean of its divisors is an integer number (2444904).

Almost surely, 2^80931540 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 80931540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117355392).

80931540 is an abundant number, since it is smaller than the sum of its proper divisors (153779244).

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

80931540 is a wasteful number, since it uses less digits than its factorization.

80931540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 80931540 is about 8996.1958626966. The cubic root of 80931540 is about 432.5529399373.

The spelling of 80931540 in words is "eighty million, nine hundred thirty-one thousand, five hundred forty".