80999578 has 24 divisors (see below), whose sum is σ = 134030484. Its totient is φ = 36685440.

The previous prime is 80999563. The next prime is 80999647. The reversal of 80999578 is 87599908.

It can be written as a sum of positive squares in 2 ways, for example, as 63250209 + 17749369 = 7953^2 + 4213^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104400 + ... + 105172.

Almost surely, 2^80999578 is an apocalyptic number.

80999578 is a deficient number, since it is larger than the sum of its proper divisors (53030906).

80999578 is a wasteful number, since it uses less digits than its factorization.

80999578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 80999578 is about 8999.9765555250. The cubic root of 80999578 is about 432.6741196967.

The spelling of 80999578 in words is "eighty million, nine hundred ninety-nine thousand, five hundred seventy-eight".