28097985 has 16 divisors (see below), whose sum is σ = 46172736. Its totient is φ = 14580288.

The previous prime is 28097977. The next prime is 28097987. The reversal of 28097985 is 58979082.

It is a happy number.

It is not a de Polignac number, because 28097985 - 2³ = 28097977 is a prime.

It is a super-2 number, since 2×28097985² = 1578993522120450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28097987) 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, 24759 + ... + 25868.

It is an arithmetic number, because the mean of its divisors is an integer number (2885796).

Almost surely, 2^28097985 is an apocalyptic number.

It is an amenable number.

28097985 is a deficient number, since it is larger than the sum of its proper divisors (18074751).

28097985 is a wasteful number, since it uses less digits than its factorization.

28097985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50672.

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

The square root of 28097985 is about 5300.7532483601. The cubic root of 28097985 is about 304.0126992906.

The spelling of 28097985 in words is "twenty-eight million, ninety-seven thousand, nine hundred eighty-five".