255477640 has 32 divisors (see below), whose sum is σ = 627082560. Its totient is φ = 92900800.

The previous prime is 255477631. The next prime is 255477643. The reversal of 255477640 is 46774552.

255477640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 255477593 and 255477602.

It is not an unprimeable number, because it can be changed into a prime (255477643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289876 + ... + 290755.

It is an arithmetic number, because the mean of its divisors is an integer number (19596330).

Almost surely, 2^255477640 is an apocalyptic number.

255477640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255477640 is an abundant number, since it is smaller than the sum of its proper divisors (371604920).

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

255477640 is a wasteful number, since it uses less digits than its factorization.

255477640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580653 (or 580649 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 255477640 is about 15983.6679144682. The cubic root of 255477640 is about 634.5282544145.

The spelling of 255477640 in words is "two hundred fifty-five million, four hundred seventy-seven thousand, six hundred forty".