642645176 has 32 divisors (see below), whose sum is σ = 1224674640. Its totient is φ = 316105728.

The previous prime is 642645167. The next prime is 642645209. The reversal of 642645176 is 671546246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131855 + ... + 136641.

Almost surely, 2^642645176 is an apocalyptic number.

It is an amenable number.

642645176 is a deficient number, since it is larger than the sum of its proper divisors (582029464).

642645176 is a wasteful number, since it uses less digits than its factorization.

642645176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063 (or 5059 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 642645176 is about 25350.4472544371. The cubic root of 642645176 is about 862.9595063502.

The spelling of 642645176 in words is "six hundred forty-two million, six hundred forty-five thousand, one hundred seventy-six".