28432499 has 4 divisors (see below), whose sum is σ = 29412960. Its totient is φ = 27452040.

The previous prime is 28432489. The next prime is 28432501. The reversal of 28432499 is 99423482.

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 28432499 - 2¹⁶ = 28366963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28432489) 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, 490187 + ... + 490244.

It is an arithmetic number, because the mean of its divisors is an integer number (7353240).

Almost surely, 2^28432499 is an apocalyptic number.

28432499 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28432499 is a deficient number, since it is larger than the sum of its proper divisors (980461).

28432499 is an equidigital number, since it uses as much as digits as its factorization.

28432499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980460.

The product of its digits is 124416, while the sum is 41.

The square root of 28432499 is about 5332.2133303160. The cubic root of 28432499 is about 305.2143937381.

The spelling of 28432499 in words is "twenty-eight million, four hundred thirty-two thousand, four hundred ninety-nine".