28451999 has 8 divisors (see below), whose sum is σ = 30420000. Its totient is φ = 26516736.

The previous prime is 28451993. The next prime is 28452007. The reversal of 28451999 is 99915482.

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

It is not a de Polignac number, because 28451999 - 2⁸ = 28451743 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 (28451993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6374 + ... + 9875.

It is an arithmetic number, because the mean of its divisors is an integer number (3802500).

Almost surely, 2^28451999 is an apocalyptic number.

28451999 is a deficient number, since it is larger than the sum of its proper divisors (1968001).

28451999 is a wasteful number, since it uses less digits than its factorization.

28451999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16369.

The product of its digits is 233280, while the sum is 47.

The square root of 28451999 is about 5334.0415258976. The cubic root of 28451999 is about 305.2841533534.

The spelling of 28451999 in words is "twenty-eight million, four hundred fifty-one thousand, nine hundred ninety-nine".