819778056 has 16 divisors (see below), whose sum is σ = 2049445200. Its totient is φ = 273259344.

The previous prime is 819778027. The next prime is 819778081. The reversal of 819778056 is 650877918.

It is a super-2 number, since 2×819778056² = 1344072122198278272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17078686 + ... + 17078733.

It is an arithmetic number, because the mean of its divisors is an integer number (128090325).

Almost surely, 2^819778056 is an apocalyptic number.

It is an amenable number.

819778056 is an abundant number, since it is smaller than the sum of its proper divisors (1229667144).

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

819778056 is a wasteful number, since it uses less digits than its factorization.

819778056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34157428 (or 34157424 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 51.

The square root of 819778056 is about 28631.7665539519. The cubic root of 819778056 is about 935.9057085963.

The spelling of 819778056 in words is "eight hundred nineteen million, seven hundred seventy-eight thousand, fifty-six".