60721609 has 4 divisors (see below), whose sum is σ = 65392516. Its totient is φ = 56050704.

The previous prime is 60721607. The next prime is 60721627. The reversal of 60721609 is 90612706.

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 14100025 + 46621584 = 3755^2 + 6828^2 .

It is a cyclic number.

It is not a de Polignac number, because 60721609 - 2¹ = 60721607 is a prime.

It is a super-2 number, since 2×60721609² = 7374227599097762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60721601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2335434 + ... + 2335459.

It is an arithmetic number, because the mean of its divisors is an integer number (16348129).

Almost surely, 2^60721609 is an apocalyptic number.

It is an amenable number.

60721609 is a deficient number, since it is larger than the sum of its proper divisors (4670907).

60721609 is a wasteful number, since it uses less digits than its factorization.

60721609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670906.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 60721609 is about 7792.4071377207. The cubic root of 60721609 is about 393.0499605199.

The spelling of 60721609 in words is "sixty million, seven hundred twenty-one thousand, six hundred nine".