861173690 has 16 divisors (see below), whose sum is σ = 1669352328. Its totient is φ = 317971776.

The previous prime is 861173683. The next prime is 861173693. The reversal of 861173690 is 96371168.

It can be written as a sum of positive squares in 4 ways, for example, as 681157801 + 180015889 = 26099^2 + 13417^2 .

It is a super-2 number, since 2×861173690² = 1483240248696432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861173693) 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, 3312077 + ... + 3312336.

Almost surely, 2^861173690 is an apocalyptic number.

861173690 is a deficient number, since it is larger than the sum of its proper divisors (808178638).

861173690 is a wasteful number, since it uses less digits than its factorization.

861173690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624433.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 861173690 is about 29345.7610226758. The cubic root of 861173690 is about 951.4009579329.

The spelling of 861173690 in words is "eight hundred sixty-one million, one hundred seventy-three thousand, six hundred ninety".