638842792 has 48 divisors (see below), whose sum is σ = 1438369920. Its totient is φ = 264952800.

The previous prime is 638842781. The next prime is 638842793. The reversal of 638842792 is 297248836.

It is a super-2 number, since 2×638842792² = 816240225780710528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (638842793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14134 + ... + 38437.

It is an arithmetic number, because the mean of its divisors is an integer number (29966040).

Almost surely, 2^638842792 is an apocalyptic number.

638842792 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

638842792 is an abundant number, since it is smaller than the sum of its proper divisors (799527128).

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

638842792 is a wasteful number, since it uses less digits than its factorization.

638842792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52622 (or 52611 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 638842792 is about 25275.3396020706. The cubic root of 638842792 is about 861.2541607607.

The spelling of 638842792 in words is "six hundred thirty-eight million, eight hundred forty-two thousand, seven hundred ninety-two".