1797744640 has 72 divisors (see below), whose sum is σ = 4323853170. Its totient is φ = 717381632.

The previous prime is 1797744601. The next prime is 1797744659. The reversal of 1797744640 is 464477971.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1617970176 + 179774464 = 40224^2 + 13408^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4290351 + ... + 4290769.

Almost surely, 2^1797744640 is an apocalyptic number.

1797744640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1797744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2161926585).

1797744640 is an abundant number, since it is smaller than the sum of its proper divisors (2526108530).

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

1797744640 is an frugal number, since it uses more digits than its factorization.

1797744640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 49.

The square root of 1797744640 is about 42399.8188675376. The cubic root of 1797744640 is about 1215.9321291759.

The spelling of 1797744640 in words is "one billion, seven hundred ninety-seven million, seven hundred forty-four thousand, six hundred forty".