72115533 has 12 divisors (see below), whose sum is σ = 119047968. Its totient is φ = 41208840.

The previous prime is 72115529. The next prime is 72115591. The reversal of 72115533 is 33551127.

It is not a de Polignac number, because 72115533 - 2² = 72115529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72115497 and 72115506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72115333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572283 + ... + 572408.

It is an arithmetic number, because the mean of its divisors is an integer number (9920664).

Almost surely, 2^72115533 is an apocalyptic number.

It is an amenable number.

72115533 is a deficient number, since it is larger than the sum of its proper divisors (46932435).

72115533 is a wasteful number, since it uses less digits than its factorization.

72115533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144704 (or 1144701 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 72115533 is about 8492.0864927296. The cubic root of 72115533 is about 416.2391626646.

The spelling of 72115533 in words is "seventy-two million, one hundred fifteen thousand, five hundred thirty-three".