27421003638 has 48 divisors (see below), whose sum is σ = 71893729440. Its totient is φ = 7373714688.

The previous prime is 27421003591. The next prime is 27421003657. The reversal of 27421003638 is 83630012472.

It is a happy number.

27421003638 is a `hidden beast` number, since 2 + 7 + 4 + 2 + 10 + 0 + 3 + 638 = 666.

It is a super-2 number, since 2×27421003638² (a number of 22 digits) 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 23 ways as a sum of consecutive naturals, for example, 6398653 + ... + 6402936.

It is an arithmetic number, because the mean of its divisors is an integer number (1497786030).

Almost surely, 2^27421003638 is an apocalyptic number.

27421003638 is an abundant number, since it is smaller than the sum of its proper divisors (44472725802).

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

27421003638 is a wasteful number, since it uses less digits than its factorization.

27421003638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12801621 (or 12801618 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 27421003638 in words is "twenty-seven billion, four hundred twenty-one million, three thousand, six hundred thirty-eight".