72006566 has 4 divisors (see below), whose sum is σ = 108009852. Its totient is φ = 36003282.

The previous prime is 72006547. The next prime is 72006569. The reversal of 72006566 is 66560027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66560027 = 1553 ⋅42859.

It is a super-2 number, since 2×72006566² = 10369891094224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72006569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18001640 + ... + 18001643.

It is an arithmetic number, because the mean of its divisors is an integer number (27002463).

Almost surely, 2^72006566 is an apocalyptic number.

72006566 is a deficient number, since it is larger than the sum of its proper divisors (36003286).

72006566 is a wasteful number, since it uses less digits than its factorization.

72006566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36003285.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 72006566 is about 8485.6682706785. The cubic root of 72006566 is about 416.0294103652.

The spelling of 72006566 in words is "seventy-two million, six thousand, five hundred sixty-six".