8021242638 has 24 divisors (see below), whose sum is σ = 17538807000. Its totient is φ = 2649217104.

The previous prime is 8021242601. The next prime is 8021242681. The reversal of 8021242638 is 8362421208.

8021242638 is a `hidden beast` number, since 8 + 0 + 2 + 12 + 4 + 2 + 638 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2042188 + ... + 2046111.

It is an arithmetic number, because the mean of its divisors is an integer number (730783625).

Almost surely, 2^8021242638 is an apocalyptic number.

8021242638 is an abundant number, since it is smaller than the sum of its proper divisors (9517564362).

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

8021242638 is a wasteful number, since it uses less digits than its factorization.

8021242638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088416 (or 4088413 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 8021242638 is about 89561.3903308786. The cubic root of 8021242638 is about 2001.7686553015.

The spelling of 8021242638 in words is "eight billion, twenty-one million, two hundred forty-two thousand, six hundred thirty-eight".