28820786 has 16 divisors (see below), whose sum is σ = 44640288. Its totient is φ = 13946400.

The previous prime is 28820783. The next prime is 28820791. The reversal of 28820786 is 68702882.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (28820783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9401 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (2790018).

Almost surely, 2^28820786 is an apocalyptic number.

28820786 is a deficient number, since it is larger than the sum of its proper divisors (15819502).

28820786 is a wasteful number, since it uses less digits than its factorization.

28820786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28820786 is about 5368.4994179007. The cubic root of 28820786 is about 306.5974983155.

The spelling of 28820786 in words is "twenty-eight million, eight hundred twenty thousand, seven hundred eighty-six".