859991772 has 12 divisors (see below), whose sum is σ = 2006647496. Its totient is φ = 286663920.

The previous prime is 859991711. The next prime is 859991779. The reversal of 859991772 is 277199958.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859991779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35832979 + ... + 35833002.

Almost surely, 2^859991772 is an apocalyptic number.

It is an amenable number.

859991772 is an abundant number, since it is smaller than the sum of its proper divisors (1146655724).

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

859991772 is a wasteful number, since it uses less digits than its factorization.

859991772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71665988 (or 71665986 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 57.

The square root of 859991772 is about 29325.6163106592. The cubic root of 859991772 is about 950.9655085174.

The spelling of 859991772 in words is "eight hundred fifty-nine million, nine hundred ninety-one thousand, seven hundred seventy-two".