812499978 has 32 divisors (see below), whose sum is σ = 1697500800. Its totient is φ = 258775616.

The previous prime is 812499977. The next prime is 812499997. The reversal of 812499978 is 879994218.

It is not an unprimeable number, because it can be changed into a prime (812499971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150388 + ... + 155696.

It is an arithmetic number, because the mean of its divisors is an integer number (53046900).

Almost surely, 2^812499978 is an apocalyptic number.

812499978 is an abundant number, since it is smaller than the sum of its proper divisors (885000822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812499978 is a wasteful number, since it uses less digits than its factorization.

812499978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446.

The product of its digits is 2612736, while the sum is 57.

The square root of 812499978 is about 28504.3852415729. The cubic root of 812499978 is about 933.1277807822.

The spelling of 812499978 in words is "eight hundred twelve million, four hundred ninety-nine thousand, nine hundred seventy-eight".