72505533 has 8 divisors (see below), whose sum is σ = 99287008. Its totient is φ = 47030544.

The previous prime is 72505529. The next prime is 72505553. The reversal of 72505533 is 33550527.

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

It is not a de Polignac number, because 72505533 - 2² = 72505529 is a prime.

It is a super-2 number, since 2×72505533² = 10514104631228178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72505533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72505553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326491 + ... + 326712.

It is an arithmetic number, because the mean of its divisors is an integer number (12410876).

Almost surely, 2^72505533 is an apocalyptic number.

It is an amenable number.

72505533 is a deficient number, since it is larger than the sum of its proper divisors (26781475).

72505533 is a wasteful number, since it uses less digits than its factorization.

72505533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653243.

The product of its (nonzero) digits is 15750, while the sum is 30.

The square root of 72505533 is about 8515.0180857119. The cubic root of 72505533 is about 416.9881530256.

The spelling of 72505533 in words is "seventy-two million, five hundred five thousand, five hundred thirty-three".