67736308644 has 135 divisors (see below), whose sum is σ = 187132303281. Its totient is φ = 21362304960.

The previous prime is 67736308639. The next prime is 67736308681. The reversal of 67736308644 is 44680363776.

It is a happy number.

The square root of 67736308644 is 260262.

It is a perfect power (a square), and thus also a powerful number.

67736308644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 177902244 + 67558406400 = 13338^2 + 259920^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 89009224 + ... + 89009984.

Almost surely, 2^67736308644 is an apocalyptic number.

67736308644 is the 260262-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67736308644

67736308644 is an abundant number, since it is smaller than the sum of its proper divisors (119395994637).

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

67736308644 is an equidigital number, since it uses as much as digits as its factorization.

67736308644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 54.

The spelling of 67736308644 in words is "sixty-seven billion, seven hundred thirty-six million, three hundred eight thousand, six hundred forty-four".