28255470 has 48 divisors (see below), whose sum is σ = 71597520. Its totient is φ = 7135488.

The previous prime is 28255463. The next prime is 28255471. The reversal of 28255470 is 7455282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9526 + ... + 12134.

It is an arithmetic number, because the mean of its divisors is an integer number (1491615).

Almost surely, 2^28255470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28255470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35798760).

28255470 is an abundant number, since it is smaller than the sum of its proper divisors (43342050).

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

28255470 is a wasteful number, since it uses less digits than its factorization.

28255470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 28255470 is about 5315.5874557757. The cubic root of 28255470 is about 304.5796233222.

The spelling of 28255470 in words is "twenty-eight million, two hundred fifty-five thousand, four hundred seventy".