80531890 has 32 divisors (see below), whose sum is σ = 153937584. Its totient is φ = 30228480.

The previous prime is 80531887. The next prime is 80531897. The reversal of 80531890 is 9813508.

It can be written as a sum of positive squares in 8 ways, for example, as 63664441 + 16867449 = 7979^2 + 4107^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (80531897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97680 + ... + 98500.

Almost surely, 2^80531890 is an apocalyptic number.

80531890 is a deficient number, since it is larger than the sum of its proper divisors (73405694).

80531890 is a wasteful number, since it uses less digits than its factorization.

80531890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 80531890 is about 8973.9562067128. The cubic root of 80531890 is about 431.8397646763.

The spelling of 80531890 in words is "eighty million, five hundred thirty-one thousand, eight hundred ninety".