72665291 has 8 divisors (see below), whose sum is σ = 76699200. Its totient is φ = 68652360.

The previous prime is 72665273. The next prime is 72665309. The reversal of 72665291 is 19256627.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72665273) and next prime (72665309).

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

It is a cyclic number.

It is not a de Polignac number, because 72665291 - 2¹⁴ = 72648907 is a prime.

It is a super-2 number, since 2×72665291² = 10560489032229362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72665251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (9587400).

Almost surely, 2^72665291 is an apocalyptic number.

72665291 is a deficient number, since it is larger than the sum of its proper divisors (4033909).

72665291 is a wasteful number, since it uses less digits than its factorization.

72665291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10489.

The product of its digits is 45360, while the sum is 38.

The square root of 72665291 is about 8524.3938787459. The cubic root of 72665291 is about 417.2941909352.

The spelling of 72665291 in words is "seventy-two million, six hundred sixty-five thousand, two hundred ninety-one".