61721612 has 12 divisors (see below), whose sum is σ = 108080616. Its totient is φ = 30841440.

The previous prime is 61721603. The next prime is 61721623. The reversal of 61721612 is 21612716.

61721612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 4208 + ... + 11880.

It is an arithmetic number, because the mean of its divisors is an integer number (9006718).

Almost surely, 2^61721612 is an apocalyptic number.

It is an amenable number.

61721612 is a deficient number, since it is larger than the sum of its proper divisors (46359004).

61721612 is a wasteful number, since it uses less digits than its factorization.

61721612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9688 (or 9686 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 61721612 is about 7856.3103299195. The cubic root of 61721612 is about 395.1958906592.

The spelling of 61721612 in words is "sixty-one million, seven hundred twenty-one thousand, six hundred twelve".