28111537 has 2 divisors, whose sum is σ = 28111538. Its totient is φ = 28111536.

The previous prime is 28111487. The next prime is 28111541. The reversal of 28111537 is 73511182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 11128896 = 4121^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 28111537 - 2⁷ = 28111409 is a prime.

It is not a weakly prime, because it can be changed into another prime (28141537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14055768 + 14055769.

It is an arithmetic number, because the mean of its divisors is an integer number (14055769).

Almost surely, 2^28111537 is an apocalyptic number.

It is an amenable number.

28111537 is a deficient number, since it is larger than the sum of its proper divisors (1).

28111537 is an equidigital number, since it uses as much as digits as its factorization.

28111537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 28111537 is about 5302.0314031511. The cubic root of 28111537 is about 304.0615677760.

The spelling of 28111537 in words is "twenty-eight million, one hundred eleven thousand, five hundred thirty-seven".