28237779 has 6 divisors (see below), whose sum is σ = 40787916. Its totient is φ = 18825180.

The previous prime is 28237777. The next prime is 28237789. The reversal of 28237779 is 97773282.

It is not a de Polignac number, because 28237779 - 2¹ = 28237777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28237777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568757 + ... + 1568774.

It is an arithmetic number, because the mean of its divisors is an integer number (6797986).

Almost surely, 2^28237779 is an apocalyptic number.

28237779 is a deficient number, since it is larger than the sum of its proper divisors (12550137).

28237779 is a wasteful number, since it uses less digits than its factorization.

28237779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137537 (or 3137534 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 28237779 is about 5313.9231270315. The cubic root of 28237779 is about 304.5160433845.

The spelling of 28237779 in words is "twenty-eight million, two hundred thirty-seven thousand, seven hundred seventy-nine".