28280655 has 48 divisors (see below), whose sum is σ = 54643680. Its totient is φ = 13434624.

The previous prime is 28280621. The next prime is 28280669. The reversal of 28280655 is 55608282.

It is not a de Polignac number, because 28280655 - 2¹⁶ = 28215119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16132 + ... + 17798.

It is an arithmetic number, because the mean of its divisors is an integer number (1138410).

Almost surely, 2^28280655 is an apocalyptic number.

28280655 is a deficient number, since it is larger than the sum of its proper divisors (26363025).

28280655 is a wasteful number, since it uses less digits than its factorization.

28280655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1717 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 28280655 is about 5317.9559042926. The cubic root of 28280655 is about 304.6700902873.

The spelling of 28280655 in words is "twenty-eight million, two hundred eighty thousand, six hundred fifty-five".