28436491 has 4 divisors (see below), whose sum is σ = 28611112. Its totient is φ = 28261872.

The previous prime is 28436467. The next prime is 28436519. The reversal of 28436491 is 19463482.

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 28436491 - 2¹⁷ = 28305419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28436491.

It is not an unprimeable number, because it can be changed into a prime (28430491) 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, 87066 + ... + 87391.

It is an arithmetic number, because the mean of its divisors is an integer number (7152778).

Almost surely, 2^28436491 is an apocalyptic number.

28436491 is a deficient number, since it is larger than the sum of its proper divisors (174621).

28436491 is a wasteful number, since it uses less digits than its factorization.

28436491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174620.

The product of its digits is 41472, while the sum is 37.

The square root of 28436491 is about 5332.5876457870. The cubic root of 28436491 is about 305.2286773793.

The spelling of 28436491 in words is "twenty-eight million, four hundred thirty-six thousand, four hundred ninety-one".