28158207 has 32 divisors (see below), whose sum is σ = 47431680. Its totient is φ = 14433120.

The previous prime is 28158191. The next prime is 28158257. The reversal of 28158207 is 70285182.

It is not a de Polignac number, because 28158207 - 2⁴ = 28158191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28158257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17478 + ... + 19020.

It is an arithmetic number, because the mean of its divisors is an integer number (1482240).

Almost surely, 2^28158207 is an apocalyptic number.

28158207 is a deficient number, since it is larger than the sum of its proper divisors (19273473).

28158207 is a wasteful number, since it uses less digits than its factorization.

28158207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28158207 is about 5306.4307213041. The cubic root of 28158207 is about 304.2297396275.

The spelling of 28158207 in words is "twenty-eight million, one hundred fifty-eight thousand, two hundred seven".