28102831 has 2 divisors, whose sum is σ = 28102832. Its totient is φ = 28102830.

The previous prime is 28102817. The next prime is 28102859. The reversal of 28102831 is 13820182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28102831 - 2¹⁹ = 27578543 is a prime.

It is a super-2 number, since 2×28102831² = 1579538220429122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28102796 and 28102805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28102871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14051415 + 14051416.

It is an arithmetic number, because the mean of its divisors is an integer number (14051416).

Almost surely, 2^28102831 is an apocalyptic number.

28102831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28102831 is an equidigital number, since it uses as much as digits as its factorization.

28102831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28102831 is about 5301.2103334993. The cubic root of 28102831 is about 304.0301757615.

The spelling of 28102831 in words is "twenty-eight million, one hundred two thousand, eight hundred thirty-one".