255575640 has 32 divisors (see below), whose sum is σ = 766727280. Its totient is φ = 68153472.

The previous prime is 255575633. The next prime is 255575653. The reversal of 255575640 is 46575552.

It is a super-2 number, since 2×255575640² = 130637815522819200, 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, 1064779 + ... + 1065018.

Almost surely, 2^255575640 is an apocalyptic number.

255575640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255575640 is an abundant number, since it is smaller than the sum of its proper divisors (511151640).

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

255575640 is a wasteful number, since it uses less digits than its factorization.

255575640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129811 (or 2129807 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 39.

The square root of 255575640 is about 15986.7332497918. The cubic root of 255575640 is about 634.6093780430.

The spelling of 255575640 in words is "two hundred fifty-five million, five hundred seventy-five thousand, six hundred forty".