255966390 has 24 divisors (see below), whose sum is σ = 665512848. Its totient is φ = 68257680.

The previous prime is 255966377. The next prime is 255966419. The reversal of 255966390 is 93669552.

255966390 is a `hidden beast` number, since 2 + 5 + 5 + 9 + 6 + 639 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1421946 + ... + 1422125.

It is an arithmetic number, because the mean of its divisors is an integer number (27729702).

Almost surely, 2^255966390 is an apocalyptic number.

255966390 is an abundant number, since it is smaller than the sum of its proper divisors (409546458).

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

255966390 is a wasteful number, since it uses less digits than its factorization.

255966390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844084 (or 2844081 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The square root of 255966390 is about 15998.9496530241. The cubic root of 255966390 is about 634.9326317850.

The spelling of 255966390 in words is "two hundred fifty-five million, nine hundred sixty-six thousand, three hundred ninety".