28099785 has 24 divisors (see below), whose sum is σ = 52301376. Its totient is φ = 12845280.

The previous prime is 28099781. The next prime is 28099789. The reversal of 28099785 is 58799082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28099781) and next prime (28099789).

It is not a de Polignac number, because 28099785 - 2² = 28099781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28099781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18381 + ... + 19850.

It is an arithmetic number, because the mean of its divisors is an integer number (2179224).

Almost surely, 2^28099785 is an apocalyptic number.

It is an amenable number.

28099785 is a deficient number, since it is larger than the sum of its proper divisors (24201591).

28099785 is a wasteful number, since it uses less digits than its factorization.

28099785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38253 (or 38246 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 28099785 is about 5300.9230328312. The cubic root of 28099785 is about 304.0191909919.

The spelling of 28099785 in words is "twenty-eight million, ninety-nine thousand, seven hundred eighty-five".