709402090 has 32 divisors (see below), whose sum is σ = 1322833680. Its totient is φ = 273715200.

The previous prime is 709402081. The next prime is 709402091. The reversal of 709402090 is 90204907.

709402090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 11015761 + 698386329 = 3319^2 + 26427^2 .

It is not an unprimeable number, because it can be changed into a prime (709402091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26770 + ... + 46210.

Almost surely, 2^709402090 is an apocalyptic number.

709402090 is a deficient number, since it is larger than the sum of its proper divisors (613431590).

709402090 is a wasteful number, since it uses less digits than its factorization.

709402090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19578.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 709402090 is about 26634.6032446515. The cubic root of 709402090 is about 891.8616462809.

Adding to 709402090 its reverse (90204907), we get a palindrome (799606997).

The spelling of 709402090 in words is "seven hundred nine million, four hundred two thousand, ninety".