28503791 has 2 divisors, whose sum is σ = 28503792. Its totient is φ = 28503790.

The previous prime is 28503773. The next prime is 28503823. The reversal of 28503791 is 19730582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28503791 is a prime.

It is a super-2 number, since 2×28503791² = 1624932202743362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28503701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14251895 + 14251896.

It is an arithmetic number, because the mean of its divisors is an integer number (14251896).

Almost surely, 2^28503791 is an apocalyptic number.

28503791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28503791 is an equidigital number, since it uses as much as digits as its factorization.

28503791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28503791 is about 5338.8941738903. The cubic root of 28503791 is about 305.4692802713.

The spelling of 28503791 in words is "twenty-eight million, five hundred three thousand, seven hundred ninety-one".