861477685 has 16 divisors (see below), whose sum is σ = 1060400880. Its totient is φ = 671639040.

The previous prime is 861477671. The next prime is 861477751. The reversal of 861477685 is 586774168.

It can be written as a sum of positive squares in 8 ways, for example, as 39050001 + 822427684 = 6249^2 + 28678^2 .

It is not a de Polignac number, because 861477685 - 2⁷ = 861477557 is a prime.

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, 20289 + ... + 46201.

It is an arithmetic number, because the mean of its divisors is an integer number (66275055).

Almost surely, 2^861477685 is an apocalyptic number.

It is an amenable number.

861477685 is a deficient number, since it is larger than the sum of its proper divisors (198923195).

861477685 is a wasteful number, since it uses less digits than its factorization.

861477685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26088.

The product of its digits is 2257920, while the sum is 52.

The square root of 861477685 is about 29350.9401041943. The cubic root of 861477685 is about 951.5128931954.

The spelling of 861477685 in words is "eight hundred sixty-one million, four hundred seventy-seven thousand, six hundred eighty-five".