800500078 has 16 divisors (see below), whose sum is σ = 1373280480. Its totient is φ = 342822816.

The previous prime is 800500061. The next prime is 800500091. The reversal of 800500078 is 870005008.

800500078 is a nontrivial binomial coefficient, being equal to C(40013, 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 40012.

It is an arithmetic number, because the mean of its divisors is an integer number (85830030).

Almost surely, 2^800500078 is an apocalyptic number.

800500078 is the 40012-nd triangular number.

800500078 is the 13338-th centered nonagonal number.

800500078 is a deficient number, since it is larger than the sum of its proper divisors (572780402).

800500078 is a wasteful number, since it uses less digits than its factorization.

800500078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41451.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 800500078 is about 28293.1100800177. The cubic root of 800500078 is about 928.5111561375.

The spelling of 800500078 in words is "eight hundred million, five hundred thousand, seventy-eight".