255705978 has 16 divisors (see below), whose sum is σ = 557904096. Its totient is φ = 77486640.

The previous prime is 255705943. The next prime is 255706051. The reversal of 255705978 is 879507552.

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, 1937101 + ... + 1937232.

It is an arithmetic number, because the mean of its divisors is an integer number (34869006).

Almost surely, 2^255705978 is an apocalyptic number.

255705978 is an abundant number, since it is smaller than the sum of its proper divisors (302198118).

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

255705978 is a wasteful number, since it uses less digits than its factorization.

255705978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874349.

The product of its (nonzero) digits is 882000, while the sum is 48.

The square root of 255705978 is about 15990.8091727717. The cubic root of 255705978 is about 634.7172386883.

The spelling of 255705978 in words is "two hundred fifty-five million, seven hundred five thousand, nine hundred seventy-eight".