28918207 has 12 divisors (see below), whose sum is σ = 31387680. Its totient is φ = 26625536.

The previous prime is 28918193. The next prime is 28918213. The reversal of 28918207 is 70281982.

It is a de Polignac number, because none of the positive numbers 2^k-28918207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28918217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12519 + ... + 14647.

It is an arithmetic number, because the mean of its divisors is an integer number (2615640).

Almost surely, 2^28918207 is an apocalyptic number.

28918207 is a deficient number, since it is larger than the sum of its proper divisors (2469473).

28918207 is a wasteful number, since it uses less digits than its factorization.

28918207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28918207 is about 5377.5651553468. The cubic root of 28918207 is about 306.9425668963.

It can be divided in two parts, 289 and 18207, that added together give a square (18496 = 136²).

The spelling of 28918207 in words is "twenty-eight million, nine hundred eighteen thousand, two hundred seven".