28157393 has 16 divisors (see below), whose sum is σ = 32182272. Its totient is φ = 24402000.

The previous prime is 28157383. The next prime is 28157429. The reversal of 28157393 is 39375182.

It is a cyclic number.

It is not a de Polignac number, because 28157393 - 2⁸ = 28157137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28157323) 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, 23630 + ... + 24792.

It is an arithmetic number, because the mean of its divisors is an integer number (2011392).

Almost surely, 2^28157393 is an apocalyptic number.

It is an amenable number.

28157393 is a deficient number, since it is larger than the sum of its proper divisors (4024879).

28157393 is a wasteful number, since it uses less digits than its factorization.

28157393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 45360, while the sum is 38.

The square root of 28157393 is about 5306.3540213597. The cubic root of 28157393 is about 304.2268080323.

The spelling of 28157393 in words is "twenty-eight million, one hundred fifty-seven thousand, three hundred ninety-three".