28315739 has 2 divisors, whose sum is σ = 28315740. Its totient is φ = 28315738.

The previous prime is 28315717. The next prime is 28315759. The reversal of 28315739 is 93751382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28315739 - 2²⁴ = 11538523 is a prime.

It is a super-2 number, since 2×28315739² = 1603562150232242, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28315709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157869 + 14157870.

It is an arithmetic number, because the mean of its divisors is an integer number (14157870).

Almost surely, 2^28315739 is an apocalyptic number.

28315739 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315739 is an equidigital number, since it uses as much as digits as its factorization.

28315739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 28315739 is about 5321.2535177343. The cubic root of 28315739 is about 304.7960259412.

The spelling of 28315739 in words is "twenty-eight million, three hundred fifteen thousand, seven hundred thirty-nine".