72066669 has 4 divisors (see below), whose sum is σ = 96088896. Its totient is φ = 48044444.

The previous prime is 72066641. The next prime is 72066691. The reversal of 72066669 is 96666027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96666027 = 3 ⋅32222009.

It is a cyclic number.

It is not a de Polignac number, because 72066669 - 2¹¹ = 72064621 is a prime.

It is a super-2 number, since 2×72066669² = 10387209561511122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72066669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72066619) 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, 12011109 + ... + 12011114.

It is an arithmetic number, because the mean of its divisors is an integer number (24022224).

Almost surely, 2^72066669 is an apocalyptic number.

It is an amenable number.

72066669 is a deficient number, since it is larger than the sum of its proper divisors (24022227).

72066669 is a wasteful number, since it uses less digits than its factorization.

72066669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24022226.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 72066669 is about 8489.2089737501. The cubic root of 72066669 is about 416.1451297283.

The spelling of 72066669 in words is "seventy-two million, sixty-six thousand, six hundred sixty-nine".