28130247 has 10 divisors (see below), whose sum is σ = 42021848. Its totient is φ = 18753444.

The previous prime is 28130231. The next prime is 28130251. The reversal of 28130247 is 74203182.

It is not a de Polignac number, because 28130247 - 2⁴ = 28130231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28130247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130647) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 173563 + ... + 173724.

Almost surely, 2^28130247 is an apocalyptic number.

28130247 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28130247 is a deficient number, since it is larger than the sum of its proper divisors (13891601).

28130247 is an equidigital number, since it uses as much as digits as its factorization.

28130247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347299 (or 347290 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28130247 is about 5303.7955277329. The cubic root of 28130247 is about 304.1290101961.

The spelling of 28130247 in words is "twenty-eight million, one hundred thirty thousand, two hundred forty-seven".