72533531 has 4 divisors (see below), whose sum is σ = 82895472. Its totient is φ = 62171592.

The previous prime is 72533497. The next prime is 72533557. The reversal of 72533531 is 13533527.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72533531 - 2²⁶ = 5424667 is a prime.

It is a super-2 number, since 2×72533531² = 10522226238655922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72533494 and 72533503.

It is not an unprimeable number, because it can be changed into a prime (72533581) 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, 5180960 + ... + 5180973.

It is an arithmetic number, because the mean of its divisors is an integer number (20723868).

Almost surely, 2^72533531 is an apocalyptic number.

72533531 is a deficient number, since it is larger than the sum of its proper divisors (10361941).

72533531 is a wasteful number, since it uses less digits than its factorization.

72533531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10361940.

The product of its digits is 9450, while the sum is 29.

The square root of 72533531 is about 8516.6619634690. The cubic root of 72533531 is about 417.0418194214.

The spelling of 72533531 in words is "seventy-two million, five hundred thirty-three thousand, five hundred thirty-one".