61891760304 has 120 divisors (see below), whose sum is σ = 189035525952. Its totient is φ = 18747327360.

The previous prime is 61891760303. The next prime is 61891760347. The reversal of 61891760304 is 40306719816.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61891760304.

It is not an unprimeable number, because it can be changed into a prime (61891760303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4686799 + ... + 4699985.

Almost surely, 2^61891760304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61891760304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94517762976).

61891760304 is an abundant number, since it is smaller than the sum of its proper divisors (127143765648).

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

61891760304 is a wasteful number, since it uses less digits than its factorization.

61891760304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16175 (or 16166 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 61891760304 in words is "sixty-one billion, eight hundred ninety-one million, seven hundred sixty thousand, three hundred four".