660768404 has 12 divisors (see below), whose sum is σ = 1166578644. Its totient is φ = 327460224.

The previous prime is 660768397. The next prime is 660768419. The reversal of 660768404 is 404867066.

It can be written as a sum of positive squares in 2 ways, for example, as 366645904 + 294122500 = 19148^2 + 17150^2 .

It is a super-2 number, since 2×660768404² = 873229767449414432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730487 + ... + 731390.

It is an arithmetic number, because the mean of its divisors is an integer number (97214887).

Almost surely, 2^660768404 is an apocalyptic number.

It is an amenable number.

660768404 is a deficient number, since it is larger than the sum of its proper divisors (505810240).

660768404 is a wasteful number, since it uses less digits than its factorization.

660768404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461994 (or 1461992 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 660768404 is about 25705.4158495831. The cubic root of 660768404 is about 870.9965257913.

The spelling of 660768404 in words is "six hundred sixty million, seven hundred sixty-eight thousand, four hundred four".