80280778 has 4 divisors (see below), whose sum is σ = 120421170. Its totient is φ = 40140388.

The previous prime is 80280721. The next prime is 80280797. The reversal of 80280778 is 87708208.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62615569 + 17665209 = 7913^2 + 4203^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 80280778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20070193 + ... + 20070196.

Almost surely, 2^80280778 is an apocalyptic number.

80280778 is a deficient number, since it is larger than the sum of its proper divisors (40140392).

80280778 is a wasteful number, since it uses less digits than its factorization.

80280778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40140391.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 80280778 is about 8959.9541293469. The cubic root of 80280778 is about 431.3904476244.

The spelling of 80280778 in words is "eighty million, two hundred eighty thousand, seven hundred seventy-eight".