528472721 has 8 divisors (see below), whose sum is σ = 604675584. Its totient is φ = 452446560.

The previous prime is 528472697. The next prime is 528472723. The reversal of 528472721 is 127274825.

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 528472721 - 2¹⁸ = 528210577 is a prime.

It is a super-2 number, since 2×528472721² = 558566833682287682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (528472723) 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, 37700 + ... + 49781.

It is an arithmetic number, because the mean of its divisors is an integer number (75584448).

Almost surely, 2^528472721 is an apocalyptic number.

It is an amenable number.

528472721 is a deficient number, since it is larger than the sum of its proper divisors (76202863).

528472721 is an equidigital number, since it uses as much as digits as its factorization.

528472721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88351.

The product of its digits is 62720, while the sum is 38.

The square root of 528472721 is about 22988.5345552952. The cubic root of 528472721 is about 808.4891416476.

The spelling of 528472721 in words is "five hundred twenty-eight million, four hundred seventy-two thousand, seven hundred twenty-one".