638572542 has 16 divisors (see below), whose sum is σ = 1282874880. Its totient is φ = 211902552.

The previous prime is 638572477. The next prime is 638572553. The reversal of 638572542 is 245275836.

It is a junction number, because it is equal to n+sod(n) for n = 638572494 and 638572503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237292 + ... + 239967.

It is an arithmetic number, because the mean of its divisors is an integer number (80179680).

Almost surely, 2^638572542 is an apocalyptic number.

638572542 is an abundant number, since it is smaller than the sum of its proper divisors (644302338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638572542 is a wasteful number, since it uses less digits than its factorization.

638572542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477487.

The product of its digits is 403200, while the sum is 42.

The square root of 638572542 is about 25269.9929165008. The cubic root of 638572542 is about 861.1326980324.

The spelling of 638572542 in words is "six hundred thirty-eight million, five hundred seventy-two thousand, five hundred forty-two".