28526399 has 4 divisors (see below), whose sum is σ = 31119720. Its totient is φ = 25933080.

The previous prime is 28526363. The next prime is 28526411. The reversal of 28526399 is 99362582.

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 28526399 - 2¹² = 28522303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28526299) 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, 1296644 + ... + 1296665.

It is an arithmetic number, because the mean of its divisors is an integer number (7779930).

Almost surely, 2^28526399 is an apocalyptic number.

28526399 is a deficient number, since it is larger than the sum of its proper divisors (2593321).

28526399 is a wasteful number, since it uses less digits than its factorization.

28526399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593320.

The product of its digits is 233280, while the sum is 44.

The square root of 28526399 is about 5341.0110466091. The cubic root of 28526399 is about 305.5500206944.

The spelling of 28526399 in words is "twenty-eight million, five hundred twenty-six thousand, three hundred ninety-nine".