52721305 has 24 divisors (see below), whose sum is σ = 79260552. Its totient is φ = 33368832.

The previous prime is 52721303. The next prime is 52721309. The reversal of 52721305 is 50312725.

52721305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8684809 + 44036496 = 2947^2 + 6636^2 .

It is not a de Polignac number, because 52721305 - 2¹ = 52721303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52721305.

It is not an unprimeable number, because it can be changed into a prime (52721303) 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 23 ways as a sum of consecutive naturals, for example, 5092 + ... + 11461.

It is an arithmetic number, because the mean of its divisors is an integer number (3302523).

Almost surely, 2^52721305 is an apocalyptic number.

It is an amenable number.

52721305 is a deficient number, since it is larger than the sum of its proper divisors (26539247).

52721305 is a wasteful number, since it uses less digits than its factorization.

52721305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16585 (or 16578 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 52721305 is about 7260.9438091752. The cubic root of 52721305 is about 374.9690166994.

The spelling of 52721305 in words is "fifty-two million, seven hundred twenty-one thousand, three hundred five".