639143548 has 6 divisors (see below), whose sum is σ = 1118501216. Its totient is φ = 319571772.

The previous prime is 639143537. The next prime is 639143551. The reversal of 639143548 is 845341936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79892940 + ... + 79892947.

Almost surely, 2^639143548 is an apocalyptic number.

It is an amenable number.

639143548 is a deficient number, since it is larger than the sum of its proper divisors (479357668).

639143548 is a wasteful number, since it uses less digits than its factorization.

639143548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159785891 (or 159785889 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 639143548 is about 25281.2884956444. The cubic root of 639143548 is about 861.3892940160.

The spelling of 639143548 in words is "six hundred thirty-nine million, one hundred forty-three thousand, five hundred forty-eight".