28056311501 has 2 divisors, whose sum is σ = 28056311502. Its totient is φ = 28056311500.

The previous prime is 28056311489. The next prime is 28056311519. The reversal of 28056311501 is 10511365082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14144344900 + 13911966601 = 118930^2 + 117949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28056311501 is a prime.

It is a super-2 number, since 2×28056311501² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056311531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028155750 + 14028155751.

It is an arithmetic number, because the mean of its divisors is an integer number (14028155751).

Almost surely, 2^28056311501 is an apocalyptic number.

It is an amenable number.

28056311501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056311501 is an equidigital number, since it uses as much as digits as its factorization.

28056311501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 28056311501 its reverse (10511365082), we get a palindrome (38567676583).

The spelling of 28056311501 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, five hundred one".