28123719 has 32 divisors (see below), whose sum is σ = 42040320. Its totient is φ = 16612992.

The previous prime is 28123703. The next prime is 28123721. The reversal of 28123719 is 91732182.

It is not a de Polignac number, because 28123719 - 2⁴ = 28123703 is a prime.

It is a super-2 number, since 2×28123719² = 1581887140781922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28123719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28123759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122697 + ... + 122925.

It is an arithmetic number, because the mean of its divisors is an integer number (1313760).

Almost surely, 2^28123719 is an apocalyptic number.

28123719 is a deficient number, since it is larger than the sum of its proper divisors (13916601).

28123719 is a wasteful number, since it uses less digits than its factorization.

28123719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its digits is 6048, while the sum is 33.

The square root of 28123719 is about 5303.1800836856. The cubic root of 28123719 is about 304.1054826415.

The spelling of 28123719 in words is "twenty-eight million, one hundred twenty-three thousand, seven hundred nineteen".