28690819 has 2 divisors, whose sum is σ = 28690820. Its totient is φ = 28690818.

The previous prime is 28690811. The next prime is 28690877. The reversal of 28690819 is 91809682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28690819 - 2³ = 28690811 is a prime.

It is a super-2 number, since 2×28690819² = 1646326189781522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28690811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345409 + 14345410.

It is an arithmetic number, because the mean of its divisors is an integer number (14345410).

Almost surely, 2^28690819 is an apocalyptic number.

28690819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28690819 is an equidigital number, since it uses as much as digits as its factorization.

28690819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28690819 is about 5356.3811477527. The cubic root of 28690819 is about 306.1359378646.

The spelling of 28690819 in words is "twenty-eight million, six hundred ninety thousand, eight hundred nineteen".