812861885 has 16 divisors (see below), whose sum is σ = 1126706112. Its totient is φ = 556396800.

The previous prime is 812861873. The next prime is 812861891. The reversal of 812861885 is 588168218.

It is not a de Polignac number, because 812861885 - 2⁴ = 812861869 is a prime.

It is a Duffinian number.

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, 433751 + ... + 435620.

It is an arithmetic number, because the mean of its divisors is an integer number (70419132).

Almost surely, 2^812861885 is an apocalyptic number.

812861885 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

812861885 is a deficient number, since it is larger than the sum of its proper divisors (313844227).

812861885 is a wasteful number, since it uses less digits than its factorization.

812861885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869404.

The product of its digits is 245760, while the sum is 47.

The square root of 812861885 is about 28510.7328036303. The cubic root of 812861885 is about 933.2663060567.

The spelling of 812861885 in words is "eight hundred twelve million, eight hundred sixty-one thousand, eight hundred eighty-five".