1985460864 has 64 divisors (see below), whose sum is σ = 5340720000. Its totient is φ = 653432832.

The previous prime is 1985460859. The next prime is 1985460871. The reversal of 1985460864 is 4680645891.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389 + ... + 63060.

It is an arithmetic number, because the mean of its divisors is an integer number (83448750).

Almost surely, 2^1985460864 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 1985460864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2670360000).

1985460864 is an abundant number, since it is smaller than the sum of its proper divisors (3355259136).

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

1985460864 is an equidigital number, since it uses as much as digits as its factorization.

1985460864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65545 (or 65533 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 1985460864 is about 44558.5105675672. The cubic root of 1985460864 is about 1256.8605945591.

The spelling of 1985460864 in words is "one billion, nine hundred eighty-five million, four hundred sixty thousand, eight hundred sixty-four".