28661427 has 12 divisors (see below), whose sum is σ = 43200144. Its totient is φ = 18276720.

The previous prime is 28661401. The next prime is 28661447. The reversal of 28661427 is 72416682.

It is not a de Polignac number, because 28661427 - 2⁶ = 28661363 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28661391 and 28661400.

It is not an unprimeable number, because it can be changed into a prime (28661447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69024 + ... + 69437.

It is an arithmetic number, because the mean of its divisors is an integer number (3600012).

Almost surely, 2^28661427 is an apocalyptic number.

28661427 is a deficient number, since it is larger than the sum of its proper divisors (14538717).

28661427 is a wasteful number, since it uses less digits than its factorization.

28661427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138490 (or 138487 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28661427 is about 5353.6368012782. The cubic root of 28661427 is about 306.0313629266.

The spelling of 28661427 in words is "twenty-eight million, six hundred sixty-one thousand, four hundred twenty-seven".