253681728 has 28 divisors (see below), whose sum is σ = 671200080. Its totient is φ = 84560512.

The previous prime is 253681721. The next prime is 253681733. The reversal of 253681728 is 827186352.

It is a self number, because there is not a number n which added to its sum of digits gives 253681728.

It is not an unprimeable number, because it can be changed into a prime (253681721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660438 + ... + 660821.

Almost surely, 2^253681728 is an apocalyptic number.

It is an amenable number.

253681728 is an abundant number, since it is smaller than the sum of its proper divisors (417518352).

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

253681728 is a wasteful number, since it uses less digits than its factorization.

253681728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321274 (or 1321264 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 253681728 is about 15927.3892399225. The cubic root of 253681728 is about 633.0379248982.

The spelling of 253681728 in words is "two hundred fifty-three million, six hundred eighty-one thousand, seven hundred twenty-eight".