28817431 has 4 divisors (see below), whose sum is σ = 30512592. Its totient is φ = 27122272.

The previous prime is 28817417. The next prime is 28817441. The reversal of 28817431 is 13471882.

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 28817431 - 2¹³ = 28809239 is a prime.

It is a super-2 number, since 2×28817431² = 1660888658879522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28817401) 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, 847555 + ... + 847588.

It is an arithmetic number, because the mean of its divisors is an integer number (7628148).

Almost surely, 2^28817431 is an apocalyptic number.

28817431 is a deficient number, since it is larger than the sum of its proper divisors (1695161).

28817431 is a wasteful number, since it uses less digits than its factorization.

28817431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695160.

The product of its digits is 10752, while the sum is 34.

The square root of 28817431 is about 5368.1869378776. The cubic root of 28817431 is about 306.5856009471.

The spelling of 28817431 in words is "twenty-eight million, eight hundred seventeen thousand, four hundred thirty-one".