73215666 has 24 divisors (see below), whose sum is σ = 158902380. Its totient is φ = 24363936.

The previous prime is 73215589. The next prime is 73215673. The reversal of 73215666 is 66651237.

It can be written as a sum of positive squares in 2 ways, for example, as 71825625 + 1390041 = 8475^2 + 1179^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 73215666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8640 + ... + 14868.

Almost surely, 2^73215666 is an apocalyptic number.

73215666 is an abundant number, since it is smaller than the sum of its proper divisors (85686714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73215666 is a wasteful number, since it uses less digits than its factorization.

73215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6890 (or 6887 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 73215666 is about 8556.6153355167. The cubic root of 73215666 is about 418.3450863968.

The spelling of 73215666 in words is "seventy-three million, two hundred fifteen thousand, six hundred sixty-six".