28400255 has 16 divisors (see below), whose sum is σ = 36813504. Its totient is φ = 20908800.

The previous prime is 28400243. The next prime is 28400257. The reversal of 28400255 is 55200482.

It is not a de Polignac number, because 28400255 - 2¹⁴ = 28383871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28400257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38702 + ... + 39428.

It is an arithmetic number, because the mean of its divisors is an integer number (2300844).

Almost surely, 2^28400255 is an apocalyptic number.

28400255 is a deficient number, since it is larger than the sum of its proper divisors (8413249).

28400255 is a wasteful number, since it uses less digits than its factorization.

28400255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 28400255 is about 5329.1889626847. The cubic root of 28400255 is about 305.0989735229.

The spelling of 28400255 in words is "twenty-eight million, four hundred thousand, two hundred fifty-five".