255987816 has 32 divisors (see below), whose sum is σ = 731394240. Its totient is φ = 73139328.

The previous prime is 255987791. The next prime is 255987839. The reversal of 255987816 is 618789552.

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, 761701 + ... + 762036.

It is an arithmetic number, because the mean of its divisors is an integer number (22856070).

Almost surely, 2^255987816 is an apocalyptic number.

It is an amenable number.

255987816 is an abundant number, since it is smaller than the sum of its proper divisors (475406424).

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

255987816 is a wasteful number, since it uses less digits than its factorization.

255987816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523753 (or 1523749 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The square root of 255987816 is about 15999.6192454696. The cubic root of 255987816 is about 634.9503472450.

The spelling of 255987816 in words is "two hundred fifty-five million, nine hundred eighty-seven thousand, eight hundred sixteen".