28340361 has 24 divisors (see below), whose sum is σ = 48519744. Its totient is φ = 16193520.

The previous prime is 28340329. The next prime is 28340383. The reversal of 28340361 is 16304382.

It is a happy number.

It is not a de Polignac number, because 28340361 - 2⁵ = 28340329 is a prime.

It is a super-2 number, since 2×28340361² = 1606352123220642, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (28340561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6630 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (2021656).

Almost surely, 2^28340361 is an apocalyptic number.

28340361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28340361 is a deficient number, since it is larger than the sum of its proper divisors (20179383).

28340361 is an equidigital number, since it uses as much as digits as its factorization.

28340361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16683 (or 16671 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28340361 is about 5323.5665676311. The cubic root of 28340361 is about 304.8843456511.

The spelling of 28340361 in words is "twenty-eight million, three hundred forty thousand, three hundred sixty-one".