28291256 has 16 divisors (see below), whose sum is σ = 60624240. Its totient is φ = 12124800.

The previous prime is 28291253. The next prime is 28291259. The reversal of 28291256 is 65219282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28291253) and next prime (28291259).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291253) 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, 252545 + ... + 252656.

It is an arithmetic number, because the mean of its divisors is an integer number (3789015).

Almost surely, 2^28291256 is an apocalyptic number.

It is an amenable number.

28291256 is an abundant number, since it is smaller than the sum of its proper divisors (32332984).

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

28291256 is a wasteful number, since it uses less digits than its factorization.

28291256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505214 (or 505210 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 28291256 is about 5318.9525284590. The cubic root of 28291256 is about 304.7081540467.

The spelling of 28291256 in words is "twenty-eight million, two hundred ninety-one thousand, two hundred fifty-six".