823081988 has 12 divisors (see below), whose sum is σ = 1444099020. Its totient is φ = 410482272.

The previous prime is 823081969. The next prime is 823081991. The reversal of 823081988 is 889180328.

It can be written as a sum of positive squares in 2 ways, for example, as 481275844 + 341806144 = 21938^2 + 18488^2 .

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, 262931 + ... + 266042.

It is an arithmetic number, because the mean of its divisors is an integer number (120341585).

Almost surely, 2^823081988 is an apocalyptic number.

It is an amenable number.

823081988 is a deficient number, since it is larger than the sum of its proper divisors (621017032).

823081988 is a wasteful number, since it uses less digits than its factorization.

823081988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529366 (or 529364 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 47.

The square root of 823081988 is about 28689.4055009859. The cubic root of 823081988 is about 937.1613427586.

The spelling of 823081988 in words is "eight hundred twenty-three million, eighty-one thousand, nine hundred eighty-eight".