28215874 has 16 divisors (see below), whose sum is σ = 44952480. Its totient is φ = 13245120.

The previous prime is 28215851. The next prime is 28215899. The reversal of 28215874 is 47851282.

It is a super-2 number, since 2×28215874² = 1592271091167752, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009 + ... + 7579.

It is an arithmetic number, because the mean of its divisors is an integer number (2809530).

Almost surely, 2^28215874 is an apocalyptic number.

28215874 is a deficient number, since it is larger than the sum of its proper divisors (16736606).

28215874 is a wasteful number, since it uses less digits than its factorization.

28215874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705.

The product of its digits is 35840, while the sum is 37.

The square root of 28215874 is about 5311.8616322340. The cubic root of 28215874 is about 304.4372818844.

The spelling of 28215874 in words is "twenty-eight million, two hundred fifteen thousand, eight hundred seventy-four".