28304277 has 16 divisors (see below), whose sum is σ = 38795328. Its totient is φ = 18345600.

The previous prime is 28304273. The next prime is 28304317. The reversal of 28304277 is 77240382.

It is not a de Polignac number, because 28304277 - 2² = 28304273 is a prime.

It is a super-2 number, since 2×28304277² = 1602264192985458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40027 + ... + 40727.

It is an arithmetic number, because the mean of its divisors is an integer number (2424708).

Almost surely, 2^28304277 is an apocalyptic number.

It is an amenable number.

28304277 is a deficient number, since it is larger than the sum of its proper divisors (10491051).

28304277 is a wasteful number, since it uses less digits than its factorization.

28304277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28304277 is about 5320.1764068497. The cubic root of 28304277 is about 304.7548940045.

The spelling of 28304277 in words is "twenty-eight million, three hundred four thousand, two hundred seventy-seven".