670965409 has 3 divisors (see below), whose sum is σ = 670991313.
Its totient is φ = 670939506.
The previous prime is 670965391. The next prime is 670965433. The reversal of 670965409 is 904569076.
The square root of 670965409 is 25903.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is a de Polignac number, because none of the positive numbers 2k-670965409 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (670965439) by changing a digit.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12952 + ... + 38854.
It is an arithmetic number, because the mean of its divisors is an integer number (223663771).
Almost surely, 2670965409 is an apocalyptic number.
670965409 is the 25903-rd square number.
670965409 is the 12952-nd centered octagonal number.
It is an amenable number.
670965409 is a deficient number, since it is larger than the sum of its proper divisors (25904).
670965409 is an frugal number, since it uses more digits than its factorization.
670965409 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 51806 (or 25903 counting only the distinct ones).
The product of its (nonzero) digits is 408240, while the sum is 46.
The cubic root of 670965409 is about 875.4540920305.
The spelling of 670965409 in words is "six hundred seventy million, nine hundred sixty-five thousand, four hundred nine".