28453491 has 16 divisors (see below), whose sum is σ = 45985920. Its totient is φ = 17244360.

The previous prime is 28453489. The next prime is 28453499. The reversal of 28453491 is 19435482.

It is not a de Polignac number, because 28453491 - 2¹ = 28453489 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28453499) 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 15 ways as a sum of consecutive naturals, for example, 47605 + ... + 48198.

It is an arithmetic number, because the mean of its divisors is an integer number (2874120).

Almost surely, 2^28453491 is an apocalyptic number.

28453491 is a deficient number, since it is larger than the sum of its proper divisors (17532429).

28453491 is a wasteful number, since it uses less digits than its factorization.

28453491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95823 (or 95817 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28453491 is about 5334.1813804932. The cubic root of 28453491 is about 305.2894895455.

Subtracting from 28453491 its reverse (19435482), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 2845 and 3491, that added together give a palindrome (6336).

The spelling of 28453491 in words is "twenty-eight million, four hundred fifty-three thousand, four hundred ninety-one".