28866919 has 8 divisors (see below), whose sum is σ = 30670560. Its totient is φ = 27117216.

The previous prime is 28866913. The next prime is 28866923. The reversal of 28866919 is 91966882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28866919 - 2²¹ = 26769767 is a prime.

It is a super-2 number, since 2×28866919² = 1666598025105122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12379 + ... + 14524.

It is an arithmetic number, because the mean of its divisors is an integer number (3833820).

Almost surely, 2^28866919 is an apocalyptic number.

28866919 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28866919 is a deficient number, since it is larger than the sum of its proper divisors (1803641).

28866919 is a wasteful number, since it uses less digits than its factorization.

28866919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26969.

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

The square root of 28866919 is about 5372.7943381447. The cubic root of 28866919 is about 306.7609997811.

The spelling of 28866919 in words is "twenty-eight million, eight hundred sixty-six thousand, nine hundred nineteen".