73280666 has 4 divisors (see below), whose sum is σ = 109921002. Its totient is φ = 36640332.

The previous prime is 73280657. The next prime is 73280671. The reversal of 73280666 is 66608237.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66608237 = 5099 ⋅13063.

It can be written as a sum of positive squares in only one way, i.e., 52258441 + 21022225 = 7229^2 + 4585^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18320165 + ... + 18320168.

Almost surely, 2^73280666 is an apocalyptic number.

73280666 is a deficient number, since it is larger than the sum of its proper divisors (36640336).

73280666 is a wasteful number, since it uses less digits than its factorization.

73280666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36640335.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 73280666 is about 8560.4127236950. The cubic root of 73280666 is about 418.4688503808.

The spelling of 73280666 in words is "seventy-three million, two hundred eighty thousand, six hundred sixty-six".