28016831 has 4 divisors (see below), whose sum is σ = 28178952. Its totient is φ = 27854712.

The previous prime is 28016819. The next prime is 28016837. The reversal of 28016831 is 13861082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13861082 = 2 ⋅6930541.

It is a cyclic number.

It is not a de Polignac number, because 28016831 - 2²² = 23822527 is a prime.

It is a super-2 number, since 2×28016831² = 1569885638565122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28016794 and 28016803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28016837) 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, 80801 + ... + 81146.

It is an arithmetic number, because the mean of its divisors is an integer number (7044738).

Almost surely, 2^28016831 is an apocalyptic number.

28016831 is a deficient number, since it is larger than the sum of its proper divisors (162121).

28016831 is a wasteful number, since it uses less digits than its factorization.

28016831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162120.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28016831 is about 5293.0927632151. The cubic root of 28016831 is about 303.7197288444.

The spelling of 28016831 in words is "twenty-eight million, sixteen thousand, eight hundred thirty-one".