638157450 has 48 divisors (see below), whose sum is σ = 1808723520. Its totient is φ = 145864320.

The previous prime is 638157439. The next prime is 638157467. The reversal of 638157450 is 54751836.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 638157399 and 638157408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302835 + ... + 304934.

It is an arithmetic number, because the mean of its divisors is an integer number (37681740).

Almost surely, 2^638157450 is an apocalyptic number.

638157450 is an abundant number, since it is smaller than the sum of its proper divisors (1170566070).

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

638157450 is a wasteful number, since it uses less digits than its factorization.

638157450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607791 (or 607786 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 638157450 is about 25261.7784409570. The cubic root of 638157450 is about 860.9460699156.

The spelling of 638157450 in words is "six hundred thirty-eight million, one hundred fifty-seven thousand, four hundred fifty".