61863449328 has 60 divisors (see below), whose sum is σ = 179544034488. Its totient is φ = 20621148480.

The previous prime is 61863449321. The next prime is 61863449359. The reversal of 61863449328 is 82394436816.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61863449321) 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 11 ways as a sum of consecutive naturals, for example, 7951803 + ... + 7959578.

Almost surely, 2^61863449328 is an apocalyptic number.

It is an amenable number.

61863449328 is an abundant number, since it is smaller than the sum of its proper divisors (117680585160).

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

61863449328 is a wasteful number, since it uses less digits than its factorization.

61863449328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15911404 (or 15911386 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The spelling of 61863449328 in words is "sixty-one billion, eight hundred sixty-three million, four hundred forty-nine thousand, three hundred twenty-eight".