668822436 has 18 divisors (see below), whose sum is σ = 1690634582. Its totient is φ = 222940800.

The previous prime is 668822419. The next prime is 668822459. The reversal of 668822436 is 634228866.

It can be written as a sum of positive squares in only one way, i.e., 533332836 + 135489600 = 23094^2 + 11640^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 668822391 and 668822400.

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, 9289165 + ... + 9289236.

Almost surely, 2^668822436 is an apocalyptic number.

It is an amenable number.

668822436 is an abundant number, since it is smaller than the sum of its proper divisors (1021812146).

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

668822436 is a wasteful number, since it uses less digits than its factorization.

668822436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18578411 (or 18578406 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 668822436 is about 25861.6015745352. The cubic root of 668822436 is about 874.5210705871.

The spelling of 668822436 in words is "six hundred sixty-eight million, eight hundred twenty-two thousand, four hundred thirty-six".