28351813 has 16 divisors (see below), whose sum is σ = 33204096. Its totient is φ = 23708160.

The previous prime is 28351783. The next prime is 28351831. The reversal of 28351813 is 31815382.

It is a de Polignac number, because none of the positive numbers 2^k-28351813 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 (28351313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57498 + ... + 57988.

It is an arithmetic number, because the mean of its divisors is an integer number (2075256).

Almost surely, 2^28351813 is an apocalyptic number.

It is an amenable number.

28351813 is a deficient number, since it is larger than the sum of its proper divisors (4852283).

28351813 is a wasteful number, since it uses less digits than its factorization.

28351813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its digits is 5760, while the sum is 31.

The square root of 28351813 is about 5324.6420536971. The cubic root of 28351813 is about 304.9254068233.

The spelling of 28351813 in words is "twenty-eight million, three hundred fifty-one thousand, eight hundred thirteen".