1898609664 has 132 divisors (see below), whose sum is σ = 5887155624. Its totient is φ = 542416896.

The previous prime is 1898609653. The next prime is 1898609683. The reversal of 1898609664 is 4669068981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144222 + ... + 156834.

Almost surely, 2^1898609664 is an apocalyptic number.

1898609664 is a gapful number since it is divisible by the number (14) 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 1898609664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2943577812).

1898609664 is an abundant number, since it is smaller than the sum of its proper divisors (3988545960).

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

1898609664 is a wasteful number, since it uses less digits than its factorization.

1898609664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12650 (or 12625 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 1898609664 is about 43573.0382690948. The cubic root of 1898609664 is about 1238.2601475252.

The spelling of 1898609664 in words is "one billion, eight hundred ninety-eight million, six hundred nine thousand, six hundred sixty-four".