28135628 has 12 divisors (see below), whose sum is σ = 49275072. Its totient is φ = 14057040.

The previous prime is 28135619. The next prime is 28135643. The reversal of 28135628 is 82653182.

It is a super-2 number, since 2×28135628² = 1583227125908768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7301 + ... + 10467.

It is an arithmetic number, because the mean of its divisors is an integer number (4106256).

Almost surely, 2^28135628 is an apocalyptic number.

It is an amenable number.

28135628 is a deficient number, since it is larger than the sum of its proper divisors (21139444).

28135628 is a wasteful number, since it uses less digits than its factorization.

28135628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392 (or 5390 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 28135628 is about 5304.3027817047. The cubic root of 28135628 is about 304.1484011133.

The spelling of 28135628 in words is "twenty-eight million, one hundred thirty-five thousand, six hundred twenty-eight".