861912086 has 32 divisors (see below), whose sum is σ = 1593285120. Its totient is φ = 341409600.

The previous prime is 861912013. The next prime is 861912113. The reversal of 861912086 is 680219168.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

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, 28610 + ... + 50421.

It is an arithmetic number, because the mean of its divisors is an integer number (49790160).

Almost surely, 2^861912086 is an apocalyptic number.

861912086 is a deficient number, since it is larger than the sum of its proper divisors (731373034).

861912086 is a wasteful number, since it uses less digits than its factorization.

861912086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79100.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 861912086 is about 29358.3392922692. The cubic root of 861912086 is about 951.6728001025.

The spelling of 861912086 in words is "eight hundred sixty-one million, nine hundred twelve thousand, eighty-six".