668402024 has 16 divisors (see below), whose sum is σ = 1255464900. Its totient is φ = 333611392.

The previous prime is 668401999. The next prime is 668402029. The reversal of 668402024 is 420204866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 653824900 + 14577124 = 25570^2 + 3818^2 .

It is a super-2 number, since 2×668402024² = 893522531374593152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668402029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68867 + ... + 77970.

Almost surely, 2^668402024 is an apocalyptic number.

It is an amenable number.

668402024 is a deficient number, since it is larger than the sum of its proper divisors (587062876).

668402024 is a wasteful number, since it uses less digits than its factorization.

668402024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147412 (or 147408 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 668402024 is about 25853.4721846022. The cubic root of 668402024 is about 874.3377951294.

The spelling of 668402024 in words is "six hundred sixty-eight million, four hundred two thousand, twenty-four".