72899666 has 16 divisors (see below), whose sum is σ = 125928000. Its totient is φ = 31003440.

The previous prime is 72899641. The next prime is 72899669. The reversal of 72899666 is 66699827.

It is a super-2 number, since 2×72899666² = 10628722605823112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72899669) 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, 18041 + ... + 21708.

It is an arithmetic number, because the mean of its divisors is an integer number (7870500).

Almost surely, 2^72899666 is an apocalyptic number.

72899666 is a deficient number, since it is larger than the sum of its proper divisors (53028334).

72899666 is a wasteful number, since it uses less digits than its factorization.

72899666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39889.

The product of its digits is 1959552, while the sum is 53.

The square root of 72899666 is about 8538.1301231593. The cubic root of 72899666 is about 417.7423570445.

The spelling of 72899666 in words is "seventy-two million, eight hundred ninety-nine thousand, six hundred sixty-six".