861771426 has 32 divisors (see below), whose sum is σ = 1735664640. Its totient is φ = 285244416.

The previous prime is 861771373. The next prime is 861771433. The reversal of 861771426 is 624177168.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792255 + ... + 793341.

It is an arithmetic number, because the mean of its divisors is an integer number (54239520).

Almost surely, 2^861771426 is an apocalyptic number.

861771426 is an abundant number, since it is smaller than the sum of its proper divisors (873893214).

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

861771426 is a wasteful number, since it uses less digits than its factorization.

861771426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 112896, while the sum is 42.

The square root of 861771426 is about 29355.9436230553. The cubic root of 861771426 is about 951.6210277772.

The spelling of 861771426 in words is "eight hundred sixty-one million, seven hundred seventy-one thousand, four hundred twenty-six".