667972628 has 12 divisors (see below), whose sum is σ = 1174887252. Its totient is φ = 332290560.

The previous prime is 667972589. The next prime is 667972633. The reversal of 667972628 is 826279766.

It can be written as a sum of positive squares in 2 ways, for example, as 606538384 + 61434244 = 24628^2 + 7838^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 667972628.

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, 423053 + ... + 424628.

It is an arithmetic number, because the mean of its divisors is an integer number (97907271).

Almost surely, 2^667972628 is an apocalyptic number.

It is an amenable number.

667972628 is a deficient number, since it is larger than the sum of its proper divisors (506914624).

667972628 is a wasteful number, since it uses less digits than its factorization.

667972628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847882 (or 847880 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 53.

The square root of 667972628 is about 25845.1664339776. The cubic root of 667972628 is about 874.1505238149.

The spelling of 667972628 in words is "six hundred sixty-seven million, nine hundred seventy-two thousand, six hundred twenty-eight".