28867819 has 8 divisors (see below), whose sum is σ = 30997728. Its totient is φ = 26785920.

The previous prime is 28867801. The next prime is 28867831. The reversal of 28867819 is 91876882.

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 28867819 - 2¹³ = 28859627 is a prime.

It is a super-2 number, since 2×28867819² = 1666701947633522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28867849) 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, 10752 + ... + 13165.

It is an arithmetic number, because the mean of its divisors is an integer number (3874716).

Almost surely, 2^28867819 is an apocalyptic number.

28867819 is a deficient number, since it is larger than the sum of its proper divisors (2129909).

28867819 is a wasteful number, since it uses less digits than its factorization.

28867819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24005.

The product of its digits is 387072, while the sum is 49.

The square root of 28867819 is about 5372.8780927916. The cubic root of 28867819 is about 306.7641877675.

The spelling of 28867819 in words is "twenty-eight million, eight hundred sixty-seven thousand, eight hundred nineteen".