863407644 has 24 divisors (see below), whose sum is σ = 2197765248. Its totient is φ = 261638640.

The previous prime is 863407619. The next prime is 863407651. The reversal of 863407644 is 446704368.

It is a junction number, because it is equal to n+sod(n) for n = 863407596 and 863407605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3270352 + ... + 3270615.

It is an arithmetic number, because the mean of its divisors is an integer number (91573552).

Almost surely, 2^863407644 is an apocalyptic number.

It is an amenable number.

863407644 is an abundant number, since it is smaller than the sum of its proper divisors (1334357604).

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

863407644 is a wasteful number, since it uses less digits than its factorization.

863407644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540985 (or 6540983 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 863407644 is about 29383.7990055745. The cubic root of 863407644 is about 952.2229178684. Note that the first 3 decimals are identical.

The spelling of 863407644 in words is "eight hundred sixty-three million, four hundred seven thousand, six hundred forty-four".