255602781 has 48 divisors (see below), whose sum is σ = 450677760. Its totient is φ = 136442880.

The previous prime is 255602761. The next prime is 255602783. The reversal of 255602781 is 187206552.

It is a happy number.

255602781 is a `hidden beast` number, since 2 + 556 + 0 + 27 + 81 = 666.

It is not a de Polignac number, because 255602781 - 2¹⁰ = 255601757 is a prime.

It is a super-2 number, since 2×255602781² = 130665563309867922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255602783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54381 + ... + 58893.

It is an arithmetic number, because the mean of its divisors is an integer number (9389120).

Almost surely, 2^255602781 is an apocalyptic number.

255602781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255602781 is a deficient number, since it is larger than the sum of its proper divisors (195074979).

255602781 is a wasteful number, since it uses less digits than its factorization.

255602781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586 (or 4583 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 255602781 is about 15987.5820873577. The cubic root of 255602781 is about 634.6318414821.

The spelling of 255602781 in words is "two hundred fifty-five million, six hundred two thousand, seven hundred eighty-one".