721928533 has 8 divisors (see below), whose sum is σ = 740033280. Its totient is φ = 703847520.

The previous prime is 721928521. The next prime is 721928549. The reversal of 721928533 is 335829127.

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

It is a cyclic number.

It is not a de Polignac number, because 721928533 - 2²⁵ = 688374101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721928033) 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, 66588 + ... + 76666.

It is an arithmetic number, because the mean of its divisors is an integer number (92504160).

Almost surely, 2^721928533 is an apocalyptic number.

It is an amenable number.

721928533 is a deficient number, since it is larger than the sum of its proper divisors (18104747).

721928533 is a wasteful number, since it uses less digits than its factorization.

721928533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11867.

The product of its digits is 90720, while the sum is 40.

The square root of 721928533 is about 26868.7277890115. The cubic root of 721928533 is about 897.0804707934.

The spelling of 721928533 in words is "seven hundred twenty-one million, nine hundred twenty-eight thousand, five hundred thirty-three".