28137757 has 2 divisors, whose sum is σ = 28137758. Its totient is φ = 28137756.

The previous prime is 28137751. The next prime is 28137773. The reversal of 28137757 is 75773182.

28137757 is nontrivially palindromic in base 7.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 12880921 = 3906^2 + 3589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28137757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28137751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14068878 + 14068879.

It is an arithmetic number, because the mean of its divisors is an integer number (14068879).

Almost surely, 2^28137757 is an apocalyptic number.

It is an amenable number.

28137757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28137757 is an equidigital number, since it uses as much as digits as its factorization.

28137757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 28137757 is about 5304.5034640388. The cubic root of 28137757 is about 304.1560724735.

The spelling of 28137757 in words is "twenty-eight million, one hundred thirty-seven thousand, seven hundred fifty-seven".