28761907 has 4 divisors (see below), whose sum is σ = 29108520. Its totient is φ = 28415296.

The previous prime is 28761857. The next prime is 28761919. The reversal of 28761907 is 70916782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70916782 = 2 ⋅35458391.

It is a cyclic number.

It is not a de Polignac number, because 28761907 - 2⁷ = 28761779 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 28761907.

It is not an unprimeable number, because it can be changed into a prime (28761947) 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 3 ways as a sum of consecutive naturals, for example, 173182 + ... + 173347.

It is an arithmetic number, because the mean of its divisors is an integer number (7277130).

Almost surely, 2^28761907 is an apocalyptic number.

28761907 is a deficient number, since it is larger than the sum of its proper divisors (346613).

28761907 is an equidigital number, since it uses as much as digits as its factorization.

28761907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346612.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 28761907 is about 5363.0128659178. The cubic root of 28761907 is about 306.3885696947.

The spelling of 28761907 in words is "twenty-eight million, seven hundred sixty-one thousand, nine hundred seven".