638372408622 has 32 divisors (see below), whose sum is σ = 1434736654848. Its totient is φ = 187882179936.

The previous prime is 638372408621. The next prime is 638372408623. The reversal of 638372408622 is 226804273836.

It is an interprime number because it is at equal distance from previous prime (638372408621) and next prime (638372408623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638372408621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177916938 + ... + 177920525.

It is an arithmetic number, because the mean of its divisors is an integer number (44835520464).

Almost surely, 2^638372408622 is an apocalyptic number.

638372408622 is an abundant number, since it is smaller than the sum of its proper divisors (796364246226).

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

638372408622 is a wasteful number, since it uses less digits than its factorization.

638372408622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355837504.

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 638372408622 in words is "six hundred thirty-eight billion, three hundred seventy-two million, four hundred eight thousand, six hundred twenty-two".