817978316 has 6 divisors (see below), whose sum is σ = 1431462060. Its totient is φ = 408989156.

The previous prime is 817978303. The next prime is 817978327. The reversal of 817978316 is 613879718.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102247286 + ... + 102247293.

It is an arithmetic number, because the mean of its divisors is an integer number (238577010).

Almost surely, 2^817978316 is an apocalyptic number.

It is an amenable number.

817978316 is a deficient number, since it is larger than the sum of its proper divisors (613483744).

817978316 is a wasteful number, since it uses less digits than its factorization.

817978316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204494583 (or 204494581 counting only the distinct ones).

The product of its digits is 508032, while the sum is 50.

The square root of 817978316 is about 28600.3202079977. The cubic root of 817978316 is about 935.2203112635.

The spelling of 817978316 in words is "eight hundred seventeen million, nine hundred seventy-eight thousand, three hundred sixteen".