28061275 has 24 divisors (see below), whose sum is σ = 38551104. Its totient is φ = 20090400.

The previous prime is 28061263. The next prime is 28061279. The reversal of 28061275 is 57216082.

It is a de Polignac number, because none of the positive numbers 2^k-28061275 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28061279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17664 + ... + 19186.

It is an arithmetic number, because the mean of its divisors is an integer number (1606296).

Almost surely, 2^28061275 is an apocalyptic number.

28061275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28061275 is a deficient number, since it is larger than the sum of its proper divisors (10489829).

28061275 is a wasteful number, since it uses less digits than its factorization.

28061275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28061275 is about 5297.2894011938. The cubic root of 28061275 is about 303.8802441219.

The spelling of 28061275 in words is "twenty-eight million, sixty-one thousand, two hundred seventy-five".