81580796 has 12 divisors (see below), whose sum is σ = 155745240. Its totient is φ = 37082160.

The previous prime is 81580787. The next prime is 81580801. The reversal of 81580796 is 69708518.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1854109 = 81580796 / (8 + 1 + 5 + 8 + 0 + 7 + 9 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927011 + ... + 927098.

It is an arithmetic number, because the mean of its divisors is an integer number (12978770).

Almost surely, 2^81580796 is an apocalyptic number.

It is an amenable number.

81580796 is a deficient number, since it is larger than the sum of its proper divisors (74164444).

81580796 is a wasteful number, since it uses less digits than its factorization.

81580796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854124 (or 1854122 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 81580796 is about 9032.2088106952. The cubic root of 81580796 is about 433.7065484244.

The spelling of 81580796 in words is "eighty-one million, five hundred eighty thousand, seven hundred ninety-six".