28057730393 has 32 divisors (see below), whose sum is σ = 37092826368. Its totient is φ = 20547072000.

The previous prime is 28057730341. The next prime is 28057730401. The reversal of 28057730393 is 39303775082.

It is not a de Polignac number, because 28057730393 - 2¹⁸ = 28057468249 is a prime.

It is a Smith number, since the sum of its digits (47) 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 not an unprimeable number, because it can be changed into a prime (28057730693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 902321 + ... + 932897.

It is an arithmetic number, because the mean of its divisors is an integer number (1159150824).

Almost surely, 2^28057730393 is an apocalyptic number.

It is an amenable number.

28057730393 is a deficient number, since it is larger than the sum of its proper divisors (9035095975).

28057730393 is a wasteful number, since it uses less digits than its factorization.

28057730393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 28057730393 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, three hundred ninety-three".