861423816 has 64 divisors (see below), whose sum is σ = 2404005120. Its totient is φ = 254963520.

The previous prime is 861423781. The next prime is 861423833. The reversal of 861423816 is 618324168.

It is a nude number because it is divisible by every one of its digits.

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, 26590 + ... + 49293.

It is an arithmetic number, because the mean of its divisors is an integer number (37562580).

Almost surely, 2^861423816 is an apocalyptic number.

861423816 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

861423816 is an abundant number, since it is smaller than the sum of its proper divisors (1542581304).

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

861423816 is a wasteful number, since it uses less digits than its factorization.

861423816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75946 (or 75942 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 861423816 is about 29350.0224190715. The cubic root of 861423816 is about 951.4930597870.

The spelling of 861423816 in words is "eight hundred sixty-one million, four hundred twenty-three thousand, eight hundred sixteen".