861142626 has 12 divisors (see below), whose sum is σ = 1865809062. Its totient is φ = 287047536.

The previous prime is 861142577. The next prime is 861142631. The reversal of 861142626 is 626241168.

It can be written as a sum of positive squares in only one way, i.e., 443144601 + 417998025 = 21051^2 + 20445^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23920611 + ... + 23920646.

Almost surely, 2^861142626 is an apocalyptic number.

861142626 is an abundant number, since it is smaller than the sum of its proper divisors (1004666436).

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

861142626 is a wasteful number, since it uses less digits than its factorization.

861142626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47841265 (or 47841262 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 861142626 is about 29345.2317421417. The cubic root of 861142626 is about 951.3895182450.

The spelling of 861142626 in words is "eight hundred sixty-one million, one hundred forty-two thousand, six hundred twenty-six".