72289663 has 4 divisors (see below), whose sum is σ = 74782440. Its totient is φ = 69796888.

The previous prime is 72289649. The next prime is 72289669. The reversal of 72289663 is 36698227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36698227 = 1459 ⋅25153.

It is a cyclic number.

It is not a de Polignac number, because 72289663 - 2¹³ = 72281471 is a prime.

It is a super-3 number, since 3×72289663³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72289669) 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, 1246345 + ... + 1246402.

It is an arithmetic number, because the mean of its divisors is an integer number (18695610).

Almost surely, 2^72289663 is an apocalyptic number.

72289663 is a deficient number, since it is larger than the sum of its proper divisors (2492777).

72289663 is a wasteful number, since it uses less digits than its factorization.

72289663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492776.

The product of its digits is 217728, while the sum is 43.

The square root of 72289663 is about 8502.3327975327. The cubic root of 72289663 is about 416.5739100902.

The spelling of 72289663 in words is "seventy-two million, two hundred eighty-nine thousand, six hundred sixty-three".