719987609 has 4 divisors (see below), whose sum is σ = 785441040. Its totient is φ = 654534180.

The previous prime is 719987603. The next prime is 719987623. The reversal of 719987609 is 906789917.

719987609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906789917 = 11 ⋅82435447.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-719987609 is a prime.

It is a super-2 number, since 2×719987609² = 1036764314227073762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (719987603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32726699 + ... + 32726720.

It is an arithmetic number, because the mean of its divisors is an integer number (196360260).

Almost surely, 2^719987609 is an apocalyptic number.

It is an amenable number.

719987609 is a deficient number, since it is larger than the sum of its proper divisors (65453431).

719987609 is a wasteful number, since it uses less digits than its factorization.

719987609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65453430.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The square root of 719987609 is about 26832.5848363515. The cubic root of 719987609 is about 896.2758076999.

The spelling of 719987609 in words is "seven hundred nineteen million, nine hundred eighty-seven thousand, six hundred nine".