28880307 has 24 divisors (see below), whose sum is σ = 43594096. Its totient is φ = 19105632.

The previous prime is 28880303. The next prime is 28880309. The reversal of 28880307 is 70308882.

It is not a de Polignac number, because 28880307 - 2² = 28880303 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 (28880303) 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, 37773 + ... + 38529.

Almost surely, 2^28880307 is an apocalyptic number.

28880307 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28880307 is a deficient number, since it is larger than the sum of its proper divisors (14713789).

28880307 is an equidigital number, since it uses as much as digits as its factorization.

28880307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28880307 is about 5374.0401003342. The cubic root of 28880307 is about 306.8084160124.

The spelling of 28880307 in words is "twenty-eight million, eight hundred eighty thousand, three hundred seven".