28715427 has 24 divisors (see below), whose sum is σ = 45221904. Its totient is φ = 17452224.

The previous prime is 28715419. The next prime is 28715437. The reversal of 28715427 is 72451782.

It is not a de Polignac number, because 28715427 - 2³ = 28715419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28715391 and 28715400.

It is not an unprimeable number, because it can be changed into a prime (28715417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8233 + ... + 11189.

It is an arithmetic number, because the mean of its divisors is an integer number (1884246).

Almost surely, 2^28715427 is an apocalyptic number.

28715427 is a deficient number, since it is larger than the sum of its proper divisors (16506477).

28715427 is a wasteful number, since it uses less digits than its factorization.

28715427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059 (or 3056 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 28715427 is about 5358.6777286939. The cubic root of 28715427 is about 306.2234367076.

The spelling of 28715427 in words is "twenty-eight million, seven hundred fifteen thousand, four hundred twenty-seven".