664678124 has 12 divisors (see below), whose sum is σ = 1268931048. Its totient is φ = 302126400.

The previous prime is 664678111. The next prime is 664678139. The reversal of 664678124 is 421876466.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 15106321 = 664678124 / (6 + 6 + 4 + 6 + 7 + 8 + 1 + 2 + 4).

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, 7553117 + ... + 7553204.

It is an arithmetic number, because the mean of its divisors is an integer number (105744254).

Almost surely, 2^664678124 is an apocalyptic number.

It is an amenable number.

664678124 is a deficient number, since it is larger than the sum of its proper divisors (604252924).

664678124 is a wasteful number, since it uses less digits than its factorization.

664678124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15106336 (or 15106334 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 664678124 is about 25781.3522531306. The cubic root of 664678124 is about 872.7110236887.

The spelling of 664678124 in words is "six hundred sixty-four million, six hundred seventy-eight thousand, one hundred twenty-four".