28436831 has 4 divisors (see below), whose sum is σ = 29205432. Its totient is φ = 27668232.

The previous prime is 28436819. The next prime is 28436861. The reversal of 28436831 is 13863482.

It is a happy number.

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 28436831 - 2¹⁰ = 28435807 is a prime.

It is a super-2 number, since 2×28436831² = 1617306714645122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28436791 and 28436800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28436861) 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, 384245 + ... + 384318.

It is an arithmetic number, because the mean of its divisors is an integer number (7301358).

Almost surely, 2^28436831 is an apocalyptic number.

28436831 is a deficient number, since it is larger than the sum of its proper divisors (768601).

28436831 is an equidigital number, since it uses as much as digits as its factorization.

28436831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768600.

The product of its digits is 27648, while the sum is 35.

The square root of 28436831 is about 5332.6195251490. The cubic root of 28436831 is about 305.2298938601.

The spelling of 28436831 in words is "twenty-eight million, four hundred thirty-six thousand, eight hundred thirty-one".