774115638 has 16 divisors (see below), whose sum is σ = 1639303920. Its totient is φ = 242859776.

The previous prime is 774115631. The next prime is 774115679. The reversal of 774115638 is 836511477.

It is a super-2 number, since 2×774115638² = 1198510041992294088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 774115638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774115631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3794583 + ... + 3794786.

It is an arithmetic number, because the mean of its divisors is an integer number (102456495).

Almost surely, 2^774115638 is an apocalyptic number.

774115638 is an abundant number, since it is smaller than the sum of its proper divisors (865188282).

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

774115638 is a wasteful number, since it uses less digits than its factorization.

774115638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7589391.

The product of its digits is 141120, while the sum is 42.

The square root of 774115638 is about 27822.9336699062. The cubic root of 774115638 is about 918.1957542683.

The spelling of 774115638 in words is "seven hundred seventy-four million, one hundred fifteen thousand, six hundred thirty-eight".