638247762 has 96 divisors (see below), whose sum is σ = 1542445632. Its totient is φ = 197074944.

The previous prime is 638247761. The next prime is 638247763. The reversal of 638247762 is 267742836.

638247762 is a `hidden beast` number, since 638 + 2 + 4 + 7 + 7 + 6 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (638247761) and next prime (638247763).

It is not an unprimeable number, because it can be changed into a prime (638247761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 552978 + ... + 554130.

It is an arithmetic number, because the mean of its divisors is an integer number (16067142).

Almost surely, 2^638247762 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638247762, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771222816).

638247762 is an abundant number, since it is smaller than the sum of its proper divisors (904197870).

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

638247762 is a wasteful number, since it uses less digits than its factorization.

638247762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1242 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 638247762 is about 25263.5659003237. The cubic root of 638247762 is about 860.9866816767.

The spelling of 638247762 in words is "six hundred thirty-eight million, two hundred forty-seven thousand, seven hundred sixty-two".