1944180864 has 48 divisors (see below), whose sum is σ = 5594586270. Its totient is φ = 648059904.

The previous prime is 1944180863. The next prime is 1944180883. The reversal of 1944180864 is 4680814491.

It can be written as a sum of positive squares in only one way, i.e., 996033600 + 948147264 = 31560^2 + 30792^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1944180863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 842677 + ... + 844980.

Almost surely, 2^1944180864 is an apocalyptic number.

It is an amenable number.

1944180864 is an abundant number, since it is smaller than the sum of its proper divisors (3650405406).

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

1944180864 is a wasteful number, since it uses less digits than its factorization.

1944180864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687677 (or 1687662 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1944180864 is about 44092.8663618051. The cubic root of 1944180864 is about 1248.0889975980.

The spelling of 1944180864 in words is "one billion, nine hundred forty-four million, one hundred eighty thousand, eight hundred sixty-four".