28102945 has 16 divisors (see below), whose sum is σ = 37094400. Its totient is φ = 20309184.

The previous prime is 28102933. The next prime is 28102967. The reversal of 28102945 is 54920182.

It is a cyclic number.

It is not a de Polignac number, because 28102945 - 2⁵ = 28102913 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1545 + ... + 7654.

It is an arithmetic number, because the mean of its divisors is an integer number (2318400).

Almost surely, 2^28102945 is an apocalyptic number.

It is an amenable number.

28102945 is a deficient number, since it is larger than the sum of its proper divisors (8991455).

28102945 is a wasteful number, since it uses less digits than its factorization.

28102945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9264.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28102945 is about 5301.2210857500. The cubic root of 28102945 is about 304.0305868635.

The spelling of 28102945 in words is "twenty-eight million, one hundred two thousand, nine hundred forty-five".