61789986 has 32 divisors (see below), whose sum is σ = 137620800. Its totient is φ = 20550240.

The previous prime is 61789979. The next prime is 61789991. The reversal of 61789986 is 68998716.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29721 + ... + 31731.

It is an arithmetic number, because the mean of its divisors is an integer number (4300650).

Almost surely, 2^61789986 is an apocalyptic number.

61789986 is an abundant number, since it is smaller than the sum of its proper divisors (75830814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61789986 is a wasteful number, since it uses less digits than its factorization.

61789986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591 (or 2585 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 61789986 is about 7860.6606592576. The cubic root of 61789986 is about 395.3417669104.

The spelling of 61789986 in words is "sixty-one million, seven hundred eighty-nine thousand, nine hundred eighty-six".