79809845 has 8 divisors (see below), whose sum is σ = 95853240. Its totient is φ = 63793600.

The previous prime is 79809817. The next prime is 79809871. The reversal of 79809845 is 54890897.

It can be written as a sum of positive squares in 4 ways, for example, as 3928324 + 75881521 = 1982^2 + 8711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79809845 - 2⁸ = 79809589 is a prime.

It is a super-2 number, since 2×79809845² = 12739222717848050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79809793 and 79809802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (11981655).

Almost surely, 2^79809845 is an apocalyptic number.

It is an amenable number.

79809845 is a deficient number, since it is larger than the sum of its proper divisors (16043395).

79809845 is a wasteful number, since it uses less digits than its factorization.

79809845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13575.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 79809845 is about 8933.6355981202. The cubic root of 79809845 is about 430.5452700484.

The spelling of 79809845 in words is "seventy-nine million, eight hundred nine thousand, eight hundred forty-five".