28214778 has 16 divisors (see below), whose sum is σ = 57012480. Its totient is φ = 9307776.

The previous prime is 28214777. The next prime is 28214801. The reversal of 28214778 is 87741282.

It is not an unprimeable number, because it can be changed into a prime (28214777) 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, 23658 + ... + 24821.

It is an arithmetic number, because the mean of its divisors is an integer number (3563280).

Almost surely, 2^28214778 is an apocalyptic number.

28214778 is an abundant number, since it is smaller than the sum of its proper divisors (28797702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28214778 is a wasteful number, since it uses less digits than its factorization.

28214778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48581.

The product of its digits is 50176, while the sum is 39.

The square root of 28214778 is about 5311.7584658943. The cubic root of 28214778 is about 304.4333400421.

The spelling of 28214778 in words is "twenty-eight million, two hundred fourteen thousand, seven hundred seventy-eight".