60721581 has 8 divisors (see below), whose sum is σ = 81009760. Its totient is φ = 40457232.

The previous prime is 60721579. The next prime is 60721589. The reversal of 60721581 is 18512706.

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

It is not a de Polignac number, because 60721581 - 2¹ = 60721579 is a prime.

It is a super-2 number, since 2×60721581² = 7374220798279122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60721589) 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, 1230 + ... + 11088.

It is an arithmetic number, because the mean of its divisors is an integer number (10126220).

Almost surely, 2^60721581 is an apocalyptic number.

It is an amenable number.

60721581 is a deficient number, since it is larger than the sum of its proper divisors (20288179).

60721581 is a wasteful number, since it uses less digits than its factorization.

60721581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11915.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 60721581 is about 7792.4053410998. The cubic root of 60721581 is about 393.0499001054.

The spelling of 60721581 in words is "sixty million, seven hundred twenty-one thousand, five hundred eighty-one".