60720521 has 4 divisors (see below), whose sum is σ = 61277700. Its totient is φ = 60163344.

The previous prime is 60720503. The next prime is 60720547. The reversal of 60720521 is 12502706.

60720521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 17305600 + 43414921 = 4160^2 + 6589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-60720521 is a prime.

It is a super-2 number, since 2×60720521² = 7373963341022882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60720571) 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 3 ways as a sum of consecutive naturals, for example, 278426 + ... + 278643.

It is an arithmetic number, because the mean of its divisors is an integer number (15319425).

Almost surely, 2^60720521 is an apocalyptic number.

It is an amenable number.

60720521 is a deficient number, since it is larger than the sum of its proper divisors (557179).

60720521 is a wasteful number, since it uses less digits than its factorization.

60720521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557178.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 60720521 is about 7792.3373258606. The cubic root of 60720521 is about 393.0476129706.

The spelling of 60720521 in words is "sixty million, seven hundred twenty thousand, five hundred twenty-one".