869628861 has 12 divisors (see below), whose sum is σ = 1285343488. Its totient is φ = 566269704.

The previous prime is 869628787. The next prime is 869628883. The reversal of 869628861 is 168826968.

It is a happy number.

869628861 is a `hidden beast` number, since 8 + 6 + 9 + 628 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 869628861 - 2⁹ = 869628349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 869628798 and 869628807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869628161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1123165 + ... + 1123938.

Almost surely, 2^869628861 is an apocalyptic number.

It is an amenable number.

869628861 is a deficient number, since it is larger than the sum of its proper divisors (415714627).

869628861 is a wasteful number, since it uses less digits than its factorization.

869628861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247152 (or 2247149 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 869628861 is about 29489.4703411235. The cubic root of 869628861 is about 954.5045028789.

It can be divided in two parts, 869628 and 861, that added together give a square (870489 = 933²).

The spelling of 869628861 in words is "eight hundred sixty-nine million, six hundred twenty-eight thousand, eight hundred sixty-one".