28788039 has 36 divisors (see below), whose sum is σ = 50061960. Its totient is φ = 15876000.

The previous prime is 28788037. The next prime is 28788049. The reversal of 28788039 is 93088782.

It is not a de Polignac number, because 28788039 - 2¹ = 28788037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28787985 and 28788003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788037) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11664 + ... + 13914.

It is an arithmetic number, because the mean of its divisors is an integer number (1390610).

Almost surely, 2^28788039 is an apocalyptic number.

28788039 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28788039 is a deficient number, since it is larger than the sum of its proper divisors (21273921).

28788039 is a wasteful number, since it uses less digits than its factorization.

28788039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 28788039 is about 5365.4486298911. The cubic root of 28788039 is about 306.4813326967.

The spelling of 28788039 in words is "twenty-eight million, seven hundred eighty-eight thousand, thirty-nine".