28231355 has 16 divisors (see below), whose sum is σ = 35376480. Its totient is φ = 21600768.

The previous prime is 28231289. The next prime is 28231387. The reversal of 28231355 is 55313282.

It is a cyclic number.

It is not a de Polignac number, because 28231355 - 2¹⁴ = 28214971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15524 + ... + 17246.

It is an arithmetic number, because the mean of its divisors is an integer number (2211030).

Almost surely, 2^28231355 is an apocalyptic number.

28231355 is a deficient number, since it is larger than the sum of its proper divisors (7145125).

28231355 is a wasteful number, since it uses less digits than its factorization.

28231355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its digits is 7200, while the sum is 29.

The square root of 28231355 is about 5313.3186428070. The cubic root of 28231355 is about 304.4929495070.

The spelling of 28231355 in words is "twenty-eight million, two hundred thirty-one thousand, three hundred fifty-five".