72663665 has 8 divisors (see below), whose sum is σ = 87246720. Its totient is φ = 58097392.

The previous prime is 72663649. The next prime is 72663667. The reversal of 72663665 is 56636627.

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 72663665 - 2⁴ = 72663649 is a prime.

It is a super-2 number, since 2×72663665² = 10560016422464450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72663667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9266 + ... + 15204.

It is an arithmetic number, because the mean of its divisors is an integer number (10905840).

Almost surely, 2^72663665 is an apocalyptic number.

It is an amenable number.

72663665 is a deficient number, since it is larger than the sum of its proper divisors (14583055).

72663665 is a wasteful number, since it uses less digits than its factorization.

72663665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8391.

The product of its digits is 272160, while the sum is 41.

The square root of 72663665 is about 8524.2985048624. The cubic root of 72663665 is about 417.2910783744.

The spelling of 72663665 in words is "seventy-two million, six hundred sixty-three thousand, six hundred sixty-five".