817472978 has 12 divisors (see below), whose sum is σ = 1426407102. Its totient is φ = 350345520.

The previous prime is 817472947. The next prime is 817472983. The reversal of 817472978 is 879274718.

817472978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 816073489 + 1399489 = 28567^2 + 1183^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4170683 + ... + 4170878.

Almost surely, 2^817472978 is an apocalyptic number.

817472978 is a deficient number, since it is larger than the sum of its proper divisors (608934124).

817472978 is a wasteful number, since it uses less digits than its factorization.

817472978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8341577 (or 8341570 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 53.

The square root of 817472978 is about 28591.4843616067. The cubic root of 817472978 is about 935.0276819852.

The spelling of 817472978 in words is "eight hundred seventeen million, four hundred seventy-two thousand, nine hundred seventy-eight".