72066997 has 4 divisors (see below), whose sum is σ = 72341280. Its totient is φ = 71792716.

The previous prime is 72066977. The next prime is 72067007. The reversal of 72066997 is 79966027.

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: 79966027 = 4931 ⋅16217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72066997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72066977) 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, 136747 + ... + 137272.

It is an arithmetic number, because the mean of its divisors is an integer number (18085320).

Almost surely, 2^72066997 is an apocalyptic number.

It is an amenable number.

72066997 is a deficient number, since it is larger than the sum of its proper divisors (274283).

72066997 is a wasteful number, since it uses less digits than its factorization.

72066997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274282.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 72066997 is about 8489.2282923715. The cubic root of 72066997 is about 416.1457610668.

It can be divided in two parts, 7206699 and 7, that added together give a triangular number (7206706 = T₃₇₉₆).

The spelling of 72066997 in words is "seventy-two million, sixty-six thousand, nine hundred ninety-seven".