1987811712 has 64 divisors (see below), whose sum is σ = 5866815600. Its totient is φ = 662602752.

The previous prime is 1987811689. The next prime is 1987811719. The reversal of 1987811712 is 2171187891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987811719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284133 + ... + 291044.

Almost surely, 2^1987811712 is an apocalyptic number.

1987811712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1987811712 is an abundant number, since it is smaller than the sum of its proper divisors (3879003888).

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

1987811712 is an equidigital number, since it uses as much as digits as its factorization.

1987811712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575200 (or 575182 counting only the distinct ones).

The product of its digits is 56448, while the sum is 45.

The square root of 1987811712 is about 44584.8821014478. The cubic root of 1987811712 is about 1257.3564530417.

The spelling of 1987811712 in words is "one billion, nine hundred eighty-seven million, eight hundred eleven thousand, seven hundred twelve".