28436331 has 72 divisors (see below), whose sum is σ = 51889152. Its totient is φ = 13543200.

The previous prime is 28436263. The next prime is 28436377. The reversal of 28436331 is 13363482.

It is not a de Polignac number, because 28436331 - 2⁹ = 28435819 is a prime.

It is a super-2 number, since 2×28436331² = 1617249841483122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28436231) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 917286 + ... + 917316.

Almost surely, 2^28436331 is an apocalyptic number.

28436331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28436331 is a deficient number, since it is larger than the sum of its proper divisors (23452821).

28436331 is a wasteful number, since it uses less digits than its factorization.

28436331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 71 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 28436331 is about 5332.5726436683. The cubic root of 28436331 is about 305.2281049144.

The spelling of 28436331 in words is "twenty-eight million, four hundred thirty-six thousand, three hundred thirty-one".