72551533 has 8 divisors (see below), whose sum is σ = 76327200. Its totient is φ = 68860848.

The previous prime is 72551513. The next prime is 72551539. The reversal of 72551533 is 33515527.

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

It is not a de Polignac number, because 72551533 - 2²¹ = 70454381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72551495 and 72551504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551539) 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, 19491 + ... + 22912.

It is an arithmetic number, because the mean of its divisors is an integer number (9540900).

Almost surely, 2^72551533 is an apocalyptic number.

It is an amenable number.

72551533 is a deficient number, since it is larger than the sum of its proper divisors (3775667).

72551533 is a wasteful number, since it uses less digits than its factorization.

72551533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42491.

The product of its digits is 15750, while the sum is 31.

The square root of 72551533 is about 8517.7187673696. The cubic root of 72551533 is about 417.0763182512.

The spelling of 72551533 in words is "seventy-two million, five hundred fifty-one thousand, five hundred thirty-three".