61328273778 has 48 divisors (see below), whose sum is σ = 138681144576. Its totient is φ = 19550287680.

The previous prime is 61328273749. The next prime is 61328273779. The reversal of 61328273778 is 87737282316.

It is a happy number.

It is a super-2 number, since 2×61328273778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61328273779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2990038 + ... + 3010478.

It is an arithmetic number, because the mean of its divisors is an integer number (2889190512).

Almost surely, 2^61328273778 is an apocalyptic number.

61328273778 is an abundant number, since it is smaller than the sum of its proper divisors (77352870798).

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

61328273778 is a wasteful number, since it uses less digits than its factorization.

61328273778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27719 (or 27716 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The spelling of 61328273778 in words is "sixty-one billion, three hundred twenty-eight million, two hundred seventy-three thousand, seven hundred seventy-eight".