28648831 has 2 divisors, whose sum is σ = 28648832. Its totient is φ = 28648830.

The previous prime is 28648811. The next prime is 28648843. The reversal of 28648831 is 13884682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28648831 - 2⁵ = 28648799 is a prime.

It is a super-2 number, since 2×28648831² = 1641511035333122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28648811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14324415 + 14324416.

It is an arithmetic number, because the mean of its divisors is an integer number (14324416).

Almost surely, 2^28648831 is an apocalyptic number.

28648831 is a deficient number, since it is larger than the sum of its proper divisors (1).

28648831 is an equidigital number, since it uses as much as digits as its factorization.

28648831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 40.

The square root of 28648831 is about 5352.4602754248. The cubic root of 28648831 is about 305.9865252443.

The spelling of 28648831 in words is "twenty-eight million, six hundred forty-eight thousand, eight hundred thirty-one".