28931901 has 8 divisors (see below), whose sum is σ = 38619264. Its totient is φ = 19266240.

The previous prime is 28931869. The next prime is 28931911. The reversal of 28931901 is 10913982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28931901 - 2⁵ = 28931869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28931911) 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 7 ways as a sum of consecutive naturals, for example, 2005 + ... + 7866.

It is an arithmetic number, because the mean of its divisors is an integer number (4827408).

Almost surely, 2^28931901 is an apocalyptic number.

It is an amenable number.

28931901 is a deficient number, since it is larger than the sum of its proper divisors (9687363).

28931901 is an equidigital number, since it uses as much as digits as its factorization.

28931901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 28931901 is about 5378.8382574679. The cubic root of 28931901 is about 306.9910093672.

The spelling of 28931901 in words is "twenty-eight million, nine hundred thirty-one thousand, nine hundred one".