60721655 has 4 divisors (see below), whose sum is σ = 72865992. Its totient is φ = 48577320.

The previous prime is 60721651. The next prime is 60721673. The reversal of 60721655 is 55612706.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 60721655 - 2² = 60721651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60721651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6072161 + ... + 6072170.

It is an arithmetic number, because the mean of its divisors is an integer number (18216498).

Almost surely, 2^60721655 is an apocalyptic number.

60721655 is a deficient number, since it is larger than the sum of its proper divisors (12144337).

60721655 is a wasteful number, since it uses less digits than its factorization.

60721655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12144336.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 60721655 is about 7792.4100893113. The cubic root of 60721655 is about 393.0500597723.

The spelling of 60721655 in words is "sixty million, seven hundred twenty-one thousand, six hundred fifty-five".