669999724 has 6 divisors (see below), whose sum is σ = 1172499524. Its totient is φ = 334999860.

The previous prime is 669999719. The next prime is 669999739. The reversal of 669999724 is 427999966.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83749962 + ... + 83749969.

Almost surely, 2^669999724 is an apocalyptic number.

It is an amenable number.

669999724 is a deficient number, since it is larger than the sum of its proper divisors (502499800).

669999724 is a wasteful number, since it uses less digits than its factorization.

669999724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167499935 (or 167499933 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 61.

The square root of 669999724 is about 25884.3528796839. The cubic root of 669999724 is about 875.0338921294.

The spelling of 669999724 in words is "six hundred sixty-nine million, nine hundred ninety-nine thousand, seven hundred twenty-four".