28278061 has 16 divisors (see below), whose sum is σ = 34243200. Its totient is φ = 22811328.

The previous prime is 28278049. The next prime is 28278073. The reversal of 28278061 is 16087282.

It is an interprime number because it is at equal distance from previous prime (28278049) and next prime (28278073).

It is a cyclic number.

It is not a de Polignac number, because 28278061 - 2¹¹ = 28276013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22395 + ... + 23623.

It is an arithmetic number, because the mean of its divisors is an integer number (2140200).

Almost surely, 2^28278061 is an apocalyptic number.

It is an amenable number.

28278061 is a deficient number, since it is larger than the sum of its proper divisors (5965139).

28278061 is a wasteful number, since it uses less digits than its factorization.

28278061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28278061 is about 5317.7120079974. The cubic root of 28278061 is about 304.6607748692.

The spelling of 28278061 in words is "twenty-eight million, two hundred seventy-eight thousand, sixty-one".