704028509 has 2 divisors, whose sum is σ = 704028510. Its totient is φ = 704028508.

The previous prime is 704028503. The next prime is 704028541. The reversal of 704028509 is 905820407.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647448025 + 56580484 = 25445^2 + 7522^2 .

It is a cyclic number.

It is not a de Polignac number, because 704028509 - 2⁸ = 704028253 is a prime.

It is a super-2 number, since 2×704028509² = 991312282969526162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (704028503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352014254 + 352014255.

It is an arithmetic number, because the mean of its divisors is an integer number (352014255).

Almost surely, 2^704028509 is an apocalyptic number.

It is an amenable number.

704028509 is a deficient number, since it is larger than the sum of its proper divisors (1).

704028509 is an equidigital number, since it uses as much as digits as its factorization.

704028509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 704028509 is about 26533.5355540870. The cubic root of 704028509 is about 889.6040442945.

The spelling of 704028509 in words is "seven hundred four million, twenty-eight thousand, five hundred nine".