28199985 has 32 divisors (see below), whose sum is σ = 49479552. Its totient is φ = 13601280.

The previous prime is 28199947. The next prime is 28200013. The reversal of 28199985 is 58999182.

It is not a de Polignac number, because 28199985 - 2⁶ = 28199921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45397 + ... + 46013.

It is an arithmetic number, because the mean of its divisors is an integer number (1546236).

Almost surely, 2^28199985 is an apocalyptic number.

It is an amenable number.

28199985 is a deficient number, since it is larger than the sum of its proper divisors (21279567).

28199985 is a wasteful number, since it uses less digits than its factorization.

28199985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913.

The product of its digits is 466560, while the sum is 51.

The square root of 28199985 is about 5310.3658066088. The cubic root of 28199985 is about 304.3801259701.

The spelling of 28199985 in words is "twenty-eight million, one hundred ninety-nine thousand, nine hundred eighty-five".