72856997 has 8 divisors (see below), whose sum is σ = 74253432. Its totient is φ = 71467200.

The previous prime is 72856981. The next prime is 72857009. The reversal of 72856997 is 79965827.

It can be written as a sum of positive squares in 4 ways, for example, as 21031396 + 51825601 = 4586^2 + 7199^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 72856997 - 2⁴ = 72856981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72856937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24263 + ... + 27099.

It is an arithmetic number, because the mean of its divisors is an integer number (9281679).

Almost surely, 2^72856997 is an apocalyptic number.

It is an amenable number.

72856997 is a deficient number, since it is larger than the sum of its proper divisors (1396435).

72856997 is a wasteful number, since it uses less digits than its factorization.

72856997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319.

The product of its digits is 1905120, while the sum is 53.

The square root of 72856997 is about 8535.6310252963. The cubic root of 72856997 is about 417.6608380271.

The spelling of 72856997 in words is "seventy-two million, eight hundred fifty-six thousand, nine hundred ninety-seven".