679553809 has 4 divisors (see below), whose sum is σ = 741331440. Its totient is φ = 617776180.

The previous prime is 679553807. The next prime is 679553857. The reversal of 679553809 is 908355976.

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.

It is a cyclic number.

It is not a de Polignac number, because 679553809 - 2¹ = 679553807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679553807) 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, 30888799 + ... + 30888820.

It is an arithmetic number, because the mean of its divisors is an integer number (185332860).

Almost surely, 2^679553809 is an apocalyptic number.

It is an amenable number.

679553809 is a deficient number, since it is larger than the sum of its proper divisors (61777631).

679553809 is a wasteful number, since it uses less digits than its factorization.

679553809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61777630.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The square root of 679553809 is about 26068.2528950446. The cubic root of 679553809 is about 879.1735564829.

The spelling of 679553809 in words is "six hundred seventy-nine million, five hundred fifty-three thousand, eight hundred nine".