28828845 has 32 divisors (see below), whose sum is σ = 51580800. Its totient is φ = 15276672.

The previous prime is 28828837. The next prime is 28828847. The reversal of 28828845 is 54882882.

It is not a de Polignac number, because 28828845 - 2³ = 28828837 is a prime.

It is a super-2 number, since 2×28828845² = 1662204608068050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28828845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28828847) 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, 23569 + ... + 24761.

It is an arithmetic number, because the mean of its divisors is an integer number (1611900).

Almost surely, 2^28828845 is an apocalyptic number.

28828845 is the 2685-th decagonal number.

It is an amenable number.

28828845 is a deficient number, since it is larger than the sum of its proper divisors (22751955).

28828845 is a wasteful number, since it uses less digits than its factorization.

28828845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386 (or 1380 counting only the distinct ones).

The product of its digits is 327680, while the sum is 45.

The square root of 28828845 is about 5369.2499476184. The cubic root of 28828845 is about 306.6260730505.

The spelling of 28828845 in words is "twenty-eight million, eight hundred twenty-eight thousand, eight hundred forty-five".