72663645 has 16 divisors (see below), whose sum is σ = 118736640. Its totient is φ = 37929024.

The previous prime is 72663637. The next prime is 72663649. The reversal of 72663645 is 54636627.

It is not a de Polignac number, because 72663645 - 2³ = 72663637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72663649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50830 + ... + 52239.

It is an arithmetic number, because the mean of its divisors is an integer number (7421040).

Almost surely, 2^72663645 is an apocalyptic number.

It is an amenable number.

72663645 is a deficient number, since it is larger than the sum of its proper divisors (46072995).

72663645 is a wasteful number, since it uses less digits than its factorization.

72663645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103124.

The product of its digits is 181440, while the sum is 39.

The square root of 72663645 is about 8524.2973317453. The cubic root of 72663645 is about 417.2910400892.

The spelling of 72663645 in words is "seventy-two million, six hundred sixty-three thousand, six hundred forty-five".