28373913 has 6 divisors (see below), whose sum is σ = 40984554. Its totient is φ = 18915936.

The previous prime is 28373911. The next prime is 28373929. The reversal of 28373913 is 31937382.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26904969 + 1468944 = 5187^2 + 1212^2 .

It is not a de Polignac number, because 28373913 - 2¹ = 28373911 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28373911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1576320 + ... + 1576337.

It is an arithmetic number, because the mean of its divisors is an integer number (6830759).

Almost surely, 2^28373913 is an apocalyptic number.

It is an amenable number.

28373913 is a deficient number, since it is larger than the sum of its proper divisors (12610641).

28373913 is a wasteful number, since it uses less digits than its factorization.

28373913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152663 (or 3152660 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 28373913 is about 5326.7169063129. The cubic root of 28373913 is about 305.0046151770.

The spelling of 28373913 in words is "twenty-eight million, three hundred seventy-three thousand, nine hundred thirteen".