1985555264 has 84 divisors (see below), whose sum is σ = 5000122080. Its totient is φ = 773579520.

The previous prime is 1985555249. The next prime is 1985555281. The reversal of 1985555264 is 4625555891.

It is a happy number.

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, 5717 + ... + 63275.

Almost surely, 2^1985555264 is an apocalyptic number.

1985555264 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 1985555264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500061040).

1985555264 is an abundant number, since it is smaller than the sum of its proper divisors (3014566816).

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

1985555264 is a wasteful number, since it uses less digits than its factorization.

1985555264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57596 (or 57579 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 50.

The square root of 1985555264 is about 44559.5698363438. The cubic root of 1985555264 is about 1256.8805136556.

The spelling of 1985555264 in words is "one billion, nine hundred eighty-five million, five hundred fifty-five thousand, two hundred sixty-four".