1798781904 has 100 divisors (see below), whose sum is σ = 5277792036. Its totient is φ = 591349248.

The previous prime is 1798781863. The next prime is 1798781939. The reversal of 1798781904 is 4091878971.

It can be written as a sum of positive squares in 2 ways, for example, as 314991504 + 1483790400 = 17748^2 + 38520^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 85102 + ... + 104114.

Almost surely, 2^1798781904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1798781904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638896018).

1798781904 is an abundant number, since it is smaller than the sum of its proper divisors (3479010132).

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

1798781904 is a wasteful number, since it uses less digits than its factorization.

1798781904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19106 (or 19091 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1798781904 is about 42412.0490426954. The cubic root of 1798781904 is about 1216.1659406792.

The spelling of 1798781904 in words is "one billion, seven hundred ninety-eight million, seven hundred eighty-one thousand, nine hundred four".