679053821 has 4 divisors (see below), whose sum is σ = 702469500. Its totient is φ = 655638144.

The previous prime is 679053803. The next prime is 679053829. The reversal of 679053821 is 128350976.

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 316341796 + 362712025 = 17786^2 + 19045^2 .

It is a cyclic number.

It is not a de Polignac number, because 679053821 - 2²² = 674859517 is a prime.

It is a super-2 number, since 2×679053821² = 922228183629400082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679053829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11707796 + ... + 11707853.

It is an arithmetic number, because the mean of its divisors is an integer number (175617375).

Almost surely, 2^679053821 is an apocalyptic number.

It is an amenable number.

679053821 is a deficient number, since it is larger than the sum of its proper divisors (23415679).

679053821 is a wasteful number, since it uses less digits than its factorization.

679053821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23415678.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 679053821 is about 26058.6611513332. The cubic root of 679053821 is about 878.9578835546.

The spelling of 679053821 in words is "six hundred seventy-nine million, fifty-three thousand, eight hundred twenty-one".