638750694450 has 48 divisors (see below), whose sum is σ = 1728110974176. Its totient is φ = 154848652800.

The previous prime is 638750694427. The next prime is 638750694497. The reversal of 638750694450 is 54496057836.

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, 193559167 + ... + 193562466.

It is an arithmetic number, because the mean of its divisors is an integer number (36002311962).

Almost surely, 2^638750694450 is an apocalyptic number.

638750694450 is an abundant number, since it is smaller than the sum of its proper divisors (1089360279726).

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

638750694450 is a wasteful number, since it uses less digits than its factorization.

638750694450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387121659 (or 387121654 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 57.

The spelling of 638750694450 in words is "six hundred thirty-eight billion, seven hundred fifty million, six hundred ninety-four thousand, four hundred fifty".