72679865 has 8 divisors (see below), whose sum is σ = 87323208. Its totient is φ = 58072320.

The previous prime is 72679861. The next prime is 72679891. The reversal of 72679865 is 56897627.

It can be written as a sum of positive squares in 4 ways, for example, as 5914624 + 66765241 = 2432^2 + 8171^2 .

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

It is not a de Polignac number, because 72679865 - 2² = 72679861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72679861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4256 + ... + 12785.

It is an arithmetic number, because the mean of its divisors is an integer number (10915401).

Almost surely, 2^72679865 is an apocalyptic number.

It is an amenable number.

72679865 is a deficient number, since it is larger than the sum of its proper divisors (14643343).

72679865 is a wasteful number, since it uses less digits than its factorization.

72679865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17899.

The product of its digits is 1270080, while the sum is 50.

The square root of 72679865 is about 8525.2486767249. The cubic root of 72679865 is about 417.3220870551.

The spelling of 72679865 in words is "seventy-two million, six hundred seventy-nine thousand, eight hundred sixty-five".