679284785 has 4 divisors (see below), whose sum is σ = 815141748. Its totient is φ = 543427824.

The previous prime is 679284721. The next prime is 679284811. The reversal of 679284785 is 587482976.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301682161 + 377602624 = 17369^2 + 19432^2 .

It is a cyclic number.

It is not a de Polignac number, because 679284785 - 2⁶ = 679284721 is a prime.

It is a super-2 number, since 2×679284785² = 922855638264992450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 679284785.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67928474 + ... + 67928483.

It is an arithmetic number, because the mean of its divisors is an integer number (203785437).

Almost surely, 2^679284785 is an apocalyptic number.

It is an amenable number.

679284785 is a deficient number, since it is larger than the sum of its proper divisors (135856963).

679284785 is a wasteful number, since it uses less digits than its factorization.

679284785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135856962.

The product of its digits is 6773760, while the sum is 56.

The square root of 679284785 is about 26063.0923913491. The cubic root of 679284785 is about 879.0575244621.

The spelling of 679284785 in words is "six hundred seventy-nine million, two hundred eighty-four thousand, seven hundred eighty-five".