611968644 has 243 divisors, whose sum is σ = 1962413271. Its totient is φ = 160302240.

The previous prime is 611968639. The next prime is 611968673. The reversal of 611968644 is 446869116.

The square root of 611968644 is 24738.

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

It is a self number, because there is not a number n which added to its sum of digits gives 611968644.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 19740909 + ... + 19740939.

Almost surely, 2^611968644 is an apocalyptic number.

611968644 is the 24738-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611968644

611968644 is an abundant number, since it is smaller than the sum of its proper divisors (1350444627).

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

611968644 is a wasteful number, since it uses less digits than its factorization.

611968644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 62 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The cubic root of 611968644 is about 849.0039747262.

The spelling of 611968644 in words is "six hundred eleven million, nine hundred sixty-eight thousand, six hundred forty-four".