28399569 has 8 divisors (see below), whose sum is σ = 41308512. Its totient is φ = 17211840.

The previous prime is 28399559. The next prime is 28399589. The reversal of 28399569 is 96599382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28399569 - 2¹⁵ = 28366801 is a prime.

It is a super-2 number, since 2×28399569² = 1613071038771522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28399559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430264 + ... + 430329.

It is an arithmetic number, because the mean of its divisors is an integer number (5163564).

Almost surely, 2^28399569 is an apocalyptic number.

It is an amenable number.

28399569 is a deficient number, since it is larger than the sum of its proper divisors (12908943).

28399569 is a wasteful number, since it uses less digits than its factorization.

28399569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860607.

The product of its digits is 1049760, while the sum is 51.

The square root of 28399569 is about 5329.1245997818. The cubic root of 28399569 is about 305.0965169771.

The spelling of 28399569 in words is "twenty-eight million, three hundred ninety-nine thousand, five hundred sixty-nine".