253420728 has 32 divisors (see below), whose sum is σ = 691148160. Its totient is φ = 76794080.

The previous prime is 253420721. The next prime is 253420747. The reversal of 253420728 is 827024352.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253420721) 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, 479700 + ... + 480227.

It is an arithmetic number, because the mean of its divisors is an integer number (21598380).

Almost surely, 2^253420728 is an apocalyptic number.

It is an amenable number.

253420728 is an abundant number, since it is smaller than the sum of its proper divisors (437727432).

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

253420728 is a wasteful number, since it uses less digits than its factorization.

253420728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959947 (or 959943 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 253420728 is about 15919.1936981745. The cubic root of 253420728 is about 632.8207504158.

The spelling of 253420728 in words is "two hundred fifty-three million, four hundred twenty thousand, seven hundred twenty-eight".