61726864000 has 128 divisors (see below), whose sum is σ = 162496685520. Its totient is φ = 23238246400.

The previous prime is 61726863937. The next prime is 61726864007. The reversal of 61726864000 is 46862716.

It can be written as a sum of positive squares in 8 ways, for example, as 24428439616 + 37298424384 = 156296^2 + 193128^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (61726864007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158532 + ... + 385468.

Almost surely, 2^61726864000 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 61726864000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81248342760).

61726864000 is an abundant number, since it is smaller than the sum of its proper divisors (100769821520).

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

61726864000 is a wasteful number, since it uses less digits than its factorization.

61726864000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226983 (or 226961 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 61726864000 in words is "sixty-one billion, seven hundred twenty-six million, eight hundred sixty-four thousand".