81791260 has 12 divisors (see below), whose sum is σ = 171761688. Its totient is φ = 32716496.

The previous prime is 81791251. The next prime is 81791261. The reversal of 81791260 is 6219718.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81791261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044762 + ... + 2044801.

It is an arithmetic number, because the mean of its divisors is an integer number (14313474).

Almost surely, 2^81791260 is an apocalyptic number.

It is an amenable number.

81791260 is an abundant number, since it is smaller than the sum of its proper divisors (89970428).

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

81791260 is a wasteful number, since it uses less digits than its factorization.

81791260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089572 (or 4089570 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 81791260 is about 9043.8520554021. The cubic root of 81791260 is about 434.0791901763.

The spelling of 81791260 in words is "eighty-one million, seven hundred ninety-one thousand, two hundred sixty".