28928907 has 28 divisors (see below), whose sum is σ = 49578480. Its totient is φ = 16527888.

The previous prime is 28928897. The next prime is 28928941. The reversal of 28928907 is 70982982.

It is not a de Polignac number, because 28928907 - 2⁴ = 28928891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28928947) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2269 + ... + 7937.

It is an arithmetic number, because the mean of its divisors is an integer number (1770660).

Almost surely, 2^28928907 is an apocalyptic number.

28928907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28928907 is the 3402-nd heptagonal number.

28928907 is a deficient number, since it is larger than the sum of its proper divisors (20649573).

28928907 is an frugal number, since it uses more digits than its factorization.

28928907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694 (or 5679 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 28928907 is about 5378.5599373810. The cubic root of 28928907 is about 306.9804194099.

The spelling of 28928907 in words is "twenty-eight million, nine hundred twenty-eight thousand, nine hundred seven".