28228730 has 16 divisors (see below), whose sum is σ = 50886144. Its totient is φ = 11274960.

The previous prime is 28228729. The next prime is 28228741. The reversal of 28228730 is 3782282.

It is a super-2 number, since 2×28228730² = 1593722394825800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6995 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (3180384).

Almost surely, 2^28228730 is an apocalyptic number.

28228730 is a deficient number, since it is larger than the sum of its proper divisors (22657414).

28228730 is a wasteful number, since it uses less digits than its factorization.

28228730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28228730 is about 5313.0716163063. The cubic root of 28228730 is about 304.4835117883.

The spelling of 28228730 in words is "twenty-eight million, two hundred twenty-eight thousand, seven hundred thirty".