816279447 has 16 divisors (see below), whose sum is σ = 1110568320. Its totient is φ = 533119392.

The previous prime is 816279439. The next prime is 816279461. The reversal of 816279447 is 744972618.

It is not a de Polignac number, because 816279447 - 2³ = 816279439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 816279396 and 816279405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816279427) 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, 114028 + ... + 120974.

It is an arithmetic number, because the mean of its divisors is an integer number (69410520).

Almost surely, 2^816279447 is an apocalyptic number.

816279447 is a deficient number, since it is larger than the sum of its proper divisors (294288873).

816279447 is a wasteful number, since it uses less digits than its factorization.

816279447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7742.

The product of its digits is 677376, while the sum is 48.

The square root of 816279447 is about 28570.6045963329. The cubic root of 816279447 is about 934.5724057387.

The spelling of 816279447 in words is "eight hundred sixteen million, two hundred seventy-nine thousand, four hundred forty-seven".