72573666 has 64 divisors (see below), whose sum is σ = 165888000. Its totient is φ = 20966400.

The previous prime is 72573659. The next prime is 72573667. The reversal of 72573666 is 66637527.

It is not an unprimeable number, because it can be changed into a prime (72573667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161410 + ... + 161858.

It is an arithmetic number, because the mean of its divisors is an integer number (2592000).

Almost surely, 2^72573666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72573666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82944000).

72573666 is an abundant number, since it is smaller than the sum of its proper divisors (93314334).

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

72573666 is a wasteful number, since it uses less digits than its factorization.

72573666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its digits is 317520, while the sum is 42.

The square root of 72573666 is about 8519.0179011433. The cubic root of 72573666 is about 417.1187258624.

The spelling of 72573666 in words is "seventy-two million, five hundred seventy-three thousand, six hundred sixty-six".