80982778 has 8 divisors (see below), whose sum is σ = 122726772. Its totient is φ = 40073856.

The previous prime is 80982773. The next prime is 80982779. The reversal of 80982778 is 87728908.

It can be written as a sum of positive squares in 2 ways, for example, as 71453209 + 9529569 = 8453^2 + 3087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (80982773) 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, 208525 + ... + 208912.

Almost surely, 2^80982778 is an apocalyptic number.

80982778 is a deficient number, since it is larger than the sum of its proper divisors (41743994).

80982778 is a wasteful number, since it uses less digits than its factorization.

80982778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417536.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 80982778 is about 8999.0431713599. The cubic root of 80982778 is about 432.6442042000.

The spelling of 80982778 in words is "eighty million, nine hundred eighty-two thousand, seven hundred seventy-eight".