28671999 has 4 divisors (see below), whose sum is σ = 38229336. Its totient is φ = 19114664.

The previous prime is 28671989. The next prime is 28672037. The reversal of 28671999 is 99917682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28671999 - 2⁴ = 28671983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778664 + ... + 4778669.

It is an arithmetic number, because the mean of its divisors is an integer number (9557334).

Almost surely, 2^28671999 is an apocalyptic number.

28671999 is a deficient number, since it is larger than the sum of its proper divisors (9557337).

28671999 is an equidigital number, since it uses as much as digits as its factorization.

28671999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9557336.

The product of its digits is 489888, while the sum is 51.

The square root of 28671999 is about 5354.6240764408. The cubic root of 28671999 is about 306.0689856853.

The spelling of 28671999 in words is "twenty-eight million, six hundred seventy-one thousand, nine hundred ninety-nine".