81880604 has 12 divisors (see below), whose sum is σ = 154313544. Its totient is φ = 37791024.

The previous prime is 81880597. The next prime is 81880607. The reversal of 81880604 is 40608818.

It is a super-2 number, since 2×81880604² = 13408866622809632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81880607) 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, 787262 + ... + 787365.

It is an arithmetic number, because the mean of its divisors is an integer number (12859462).

Almost surely, 2^81880604 is an apocalyptic number.

It is an amenable number.

81880604 is a deficient number, since it is larger than the sum of its proper divisors (72432940).

81880604 is a wasteful number, since it uses less digits than its factorization.

81880604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574644 (or 1574642 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 81880604 is about 9048.7901953797. The cubic root of 81880604 is about 434.2371869212.

The spelling of 81880604 in words is "eighty-one million, eight hundred eighty thousand, six hundred four".