28197699 has 4 divisors (see below), whose sum is σ = 37596936. Its totient is φ = 18798464.

The previous prime is 28197647. The next prime is 28197731. The reversal of 28197699 is 99679182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28197699 - 2⁹ = 28197187 is a prime.

It is a super-2 number, since 2×28197699² = 1590220457789202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28197629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699614 + ... + 4699619.

It is an arithmetic number, because the mean of its divisors is an integer number (9399234).

Almost surely, 2^28197699 is an apocalyptic number.

28197699 is a deficient number, since it is larger than the sum of its proper divisors (9399237).

28197699 is an equidigital number, since it uses as much as digits as its factorization.

28197699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399236.

The product of its digits is 489888, while the sum is 51.

The square root of 28197699 is about 5310.1505628372. The cubic root of 28197699 is about 304.3719010039.

The spelling of 28197699 in words is "twenty-eight million, one hundred ninety-seven thousand, six hundred ninety-nine".