28137819 has 8 divisors (see below), whose sum is σ = 38315520. Its totient is φ = 18359336.

The previous prime is 28137817. The next prime is 28137821. The reversal of 28137819 is 91873182.

It is an interprime number because it is at equal distance from previous prime (28137817) and next prime (28137821).

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 28137819 - 2¹ = 28137817 is a prime.

It is a super-2 number, since 2×28137819² = 1583473716153522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28137817) 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, 99639 + ... + 99920.

It is an arithmetic number, because the mean of its divisors is an integer number (4789440).

Almost surely, 2^28137819 is an apocalyptic number.

28137819 is a deficient number, since it is larger than the sum of its proper divisors (10177701).

28137819 is a wasteful number, since it uses less digits than its factorization.

28137819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199609.

The product of its digits is 24192, while the sum is 39.

The square root of 28137819 is about 5304.5093081264. The cubic root of 28137819 is about 304.1562958704.

The spelling of 28137819 in words is "twenty-eight million, one hundred thirty-seven thousand, eight hundred nineteen".