1945868544 has 81 divisors (see below), whose sum is σ = 5616530283. Its totient is φ = 647917056.

The previous prime is 1945868537. The next prime is 1945868549. The reversal of 1945868544 is 4458685491.

The square root of 1945868544 is 44112.

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

1945868544 is a `hidden beast` number, since 1 + 9 + 4 + 586 + 8 + 54 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1945868549) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2116917 + ... + 2117835.

Almost surely, 2^1945868544 is an apocalyptic number.

1945868544 is the 44112-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1945868544

1945868544 is an abundant number, since it is smaller than the sum of its proper divisors (3670661739).

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

1945868544 is an frugal number, since it uses more digits than its factorization.

1945868544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860 (or 924 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The cubic root of 1945868544 is about 1248.4500349343.

It can be divided in two parts, 1945 and 868544, that added together give a square (870489 = 933²).

The spelling of 1945868544 in words is "one billion, nine hundred forty-five million, eight hundred sixty-eight thousand, five hundred forty-four".