862644138 has 16 divisors (see below), whose sum is σ = 1726673760. Its totient is φ = 287317136.

The previous prime is 862644119. The next prime is 862644151. The reversal of 862644138 is 831446268.

It is a self number, because there is not a number n which added to its sum of digits gives 862644138.

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, 49545 + ... + 64652.

It is an arithmetic number, because the mean of its divisors is an integer number (107917110).

Almost surely, 2^862644138 is an apocalyptic number.

862644138 is an abundant number, since it is smaller than the sum of its proper divisors (864029622).

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

862644138 is a wasteful number, since it uses less digits than its factorization.

862644138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115461.

The product of its digits is 221184, while the sum is 42.

The square root of 862644138 is about 29370.8041769373. The cubic root of 862644138 is about 951.9421534950.

The spelling of 862644138 in words is "eight hundred sixty-two million, six hundred forty-four thousand, one hundred thirty-eight".