61489777828 has 24 divisors (see below), whose sum is σ = 108142463520. Its totient is φ = 30592000320.

The previous prime is 61489777813. The next prime is 61489777831. The reversal of 61489777828 is 82877798416.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6851328 + ... + 6860296.

It is an arithmetic number, because the mean of its divisors is an integer number (4505935980).

Almost surely, 2^61489777828 is an apocalyptic number.

It is an amenable number.

61489777828 is a deficient number, since it is larger than the sum of its proper divisors (46652685692).

61489777828 is a wasteful number, since it uses less digits than its factorization.

61489777828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17307 (or 17305 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 67.

The spelling of 61489777828 in words is "sixty-one billion, four hundred eighty-nine million, seven hundred seventy-seven thousand, eight hundred twenty-eight".