72896399857 has 16 divisors (see below), whose sum is σ = 78862947840. Its totient is φ = 67117700608.

The previous prime is 72896399831. The next prime is 72896399861. The reversal of 72896399857 is 75899369827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72896399857 is a prime.

It is a super-2 number, since 2×72896399857² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72896399857.

It is not an unprimeable number, because it can be changed into a prime (72896399827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1815444 + ... + 1855162.

It is an arithmetic number, because the mean of its divisors is an integer number (4928934240).

Almost surely, 2^72896399857 is an apocalyptic number.

It is an amenable number.

72896399857 is a deficient number, since it is larger than the sum of its proper divisors (5966547983).

72896399857 is a wasteful number, since it uses less digits than its factorization.

72896399857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42080.

The product of its digits is 411505920, while the sum is 73.

The spelling of 72896399857 in words is "seventy-two billion, eight hundred ninety-six million, three hundred ninety-nine thousand, eight hundred fifty-seven".