28966819 has 16 divisors (see below), whose sum is σ = 34379968. Its totient is φ = 23887872.

The previous prime is 28966813. The next prime is 28966831. The reversal of 28966819 is 91866982.

It is a happy number.

It is a 15-Lehmer number, since φ(28966819) divides (28966819-1)¹⁵.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28966819 is a prime.

It is a super-2 number, since 2×28966819² = 1678153205957522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28966813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24547 + ... + 25699.

It is an arithmetic number, because the mean of its divisors is an integer number (2148748).

Almost surely, 2^28966819 is an apocalyptic number.

28966819 is a deficient number, since it is larger than the sum of its proper divisors (5413149).

28966819 is a wasteful number, since it uses less digits than its factorization.

28966819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294.

The product of its digits is 373248, while the sum is 49.

The square root of 28966819 is about 5382.0831468865. The cubic root of 28966819 is about 307.1144625119.

The spelling of 28966819 in words is "twenty-eight million, nine hundred sixty-six thousand, eight hundred nineteen".