638627862 has 16 divisors (see below), whose sum is σ = 1288560240. Its totient is φ = 210991872.

The previous prime is 638627851. The next prime is 638627897. The reversal of 638627862 is 268726836.

It is a happy number.

It is a super-2 number, since 2×638627862² = 815691092245382088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470287 + ... + 471642.

It is an arithmetic number, because the mean of its divisors is an integer number (80535015).

Almost surely, 2^638627862 is an apocalyptic number.

638627862 is an abundant number, since it is smaller than the sum of its proper divisors (649932378).

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

638627862 is a wasteful number, since it uses less digits than its factorization.

638627862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942047.

The product of its digits is 1161216, while the sum is 48.

The square root of 638627862 is about 25271.0874716542. The cubic root of 638627862 is about 861.1575641633.

The spelling of 638627862 in words is "six hundred thirty-eight million, six hundred twenty-seven thousand, eight hundred sixty-two".