61721108 has 6 divisors (see below), whose sum is σ = 108011946. Its totient is φ = 30860552.

The previous prime is 61721071. The next prime is 61721123. The reversal of 61721108 is 80112716.

61721108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 51811204 + 9909904 = 7198^2 + 3148^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 7715135 + ... + 7715142.

It is an arithmetic number, because the mean of its divisors is an integer number (18001991).

Almost surely, 2^61721108 is an apocalyptic number.

It is an amenable number.

61721108 is a deficient number, since it is larger than the sum of its proper divisors (46290838).

61721108 is a wasteful number, since it uses less digits than its factorization.

61721108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15430281 (or 15430279 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 61721108 is about 7856.2782537280. The cubic root of 61721108 is about 395.1948149729.

The spelling of 61721108 in words is "sixty-one million, seven hundred twenty-one thousand, one hundred eight".