645179870 has 8 divisors (see below), whose sum is σ = 1161323784. Its totient is φ = 258071944.

The previous prime is 645179867. The next prime is 645179891. The reversal of 645179870 is 78971546.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 32258984 + ... + 32259003.

It is an arithmetic number, because the mean of its divisors is an integer number (145165473).

Almost surely, 2^645179870 is an apocalyptic number.

645179870 is a deficient number, since it is larger than the sum of its proper divisors (516143914).

645179870 is a wasteful number, since it uses less digits than its factorization.

645179870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64517994.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 645179870 is about 25400.3911387207. The cubic root of 645179870 is about 864.0925674927.

The spelling of 645179870 in words is "six hundred forty-five million, one hundred seventy-nine thousand, eight hundred seventy".