80812557 has 12 divisors (see below), whose sum is σ = 133404960. Its totient is φ = 46178568.

The previous prime is 80812553. The next prime is 80812559. The reversal of 80812557 is 75521808.

It is not a de Polignac number, because 80812557 - 2² = 80812553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80812553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 641307 + ... + 641432.

It is an arithmetic number, because the mean of its divisors is an integer number (11117080).

Almost surely, 2^80812557 is an apocalyptic number.

It is an amenable number.

80812557 is a deficient number, since it is larger than the sum of its proper divisors (52592403).

80812557 is a wasteful number, since it uses less digits than its factorization.

80812557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282752 (or 1282749 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 80812557 is about 8989.5804685202. The cubic root of 80812557 is about 432.3408607383.

The spelling of 80812557 in words is "eighty million, eight hundred twelve thousand, five hundred fifty-seven".