5631781908 has 24 divisors (see below), whose sum is σ = 13388766048. Its totient is φ = 1841840416.

The previous prime is 5631781871. The next prime is 5631781921. The reversal of 5631781908 is 8091871365.

It is a super-2 number, since 2×5631781908² = 63433934918552240928, which contains 22 as substring.

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, 4426866 + ... + 4428137.

It is an arithmetic number, because the mean of its divisors is an integer number (557865252).

Almost surely, 2^5631781908 is an apocalyptic number.

It is an amenable number.

5631781908 is an abundant number, since it is smaller than the sum of its proper divisors (7756984140).

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

5631781908 is a wasteful number, since it uses less digits than its factorization.

5631781908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855063 (or 8855061 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 5631781908 is about 75045.1991002756. The cubic root of 5631781908 is about 1779.1611066161.

The spelling of 5631781908 in words is "five billion, six hundred thirty-one million, seven hundred eighty-one thousand, nine hundred eight".