639652145 has 16 divisors (see below), whose sum is σ = 845500032. Its totient is φ = 460680960.

The previous prime is 639652129. The next prime is 639652151. The reversal of 639652145 is 541256936.

It is not a de Polignac number, because 639652145 - 2⁴ = 639652129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50792 + ... + 62121.

It is an arithmetic number, because the mean of its divisors is an integer number (52843752).

Almost surely, 2^639652145 is an apocalyptic number.

It is an amenable number.

639652145 is a deficient number, since it is larger than the sum of its proper divisors (205847887).

639652145 is a wasteful number, since it uses less digits than its factorization.

639652145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113032.

The product of its digits is 194400, while the sum is 41.

The square root of 639652145 is about 25291.3452588035. The cubic root of 639652145 is about 861.6177162840.

The spelling of 639652145 in words is "six hundred thirty-nine million, six hundred fifty-two thousand, one hundred forty-five".