800573978 has 4 divisors (see below), whose sum is σ = 1200860970. Its totient is φ = 400286988.

The previous prime is 800573959. The next prime is 800573993. The reversal of 800573978 is 879375008.

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., 569442769 + 231131209 = 23863^2 + 15203^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200143493 + ... + 200143496.

Almost surely, 2^800573978 is an apocalyptic number.

800573978 is a deficient number, since it is larger than the sum of its proper divisors (400286992).

800573978 is a wasteful number, since it uses less digits than its factorization.

800573978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400286991.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 800573978 is about 28294.4160215404. The cubic root of 800573978 is about 928.5397278037.

The spelling of 800573978 in words is "eight hundred million, five hundred seventy-three thousand, nine hundred seventy-eight".