72812533 has 4 divisors (see below), whose sum is σ = 75323340. Its totient is φ = 70301728.

The previous prime is 72812527. The next prime is 72812561. The reversal of 72812533 is 33521827.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44328964 + 28483569 = 6658^2 + 5337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72812533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72812495 and 72812504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72818533) 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, 1255360 + ... + 1255417.

It is an arithmetic number, because the mean of its divisors is an integer number (18830835).

Almost surely, 2^72812533 is an apocalyptic number.

It is an amenable number.

72812533 is a deficient number, since it is larger than the sum of its proper divisors (2510807).

72812533 is a wasteful number, since it uses less digits than its factorization.

72812533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510806.

The product of its digits is 10080, while the sum is 31.

The square root of 72812533 is about 8533.0260166016. The cubic root of 72812533 is about 417.5758557951.

The spelling of 72812533 in words is "seventy-two million, eight hundred twelve thousand, five hundred thirty-three".