72307666 has 8 divisors (see below), whose sum is σ = 108935820. Its totient is φ = 35995728.

The previous prime is 72307663. The next prime is 72307679. The reversal of 72307666 is 66670327.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68807025 + 3500641 = 8295^2 + 1871^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72307663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78481 + ... + 79396.

Almost surely, 2^72307666 is an apocalyptic number.

72307666 is a deficient number, since it is larger than the sum of its proper divisors (36628154).

72307666 is a wasteful number, since it uses less digits than its factorization.

72307666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158108.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 72307666 is about 8503.3914410663. The cubic root of 72307666 is about 416.6084883748.

The spelling of 72307666 in words is "seventy-two million, three hundred seven thousand, six hundred sixty-six".