1987043264 has 42 divisors (see below), whose sum is σ = 4052666520. Its totient is φ = 966627072.

The previous prime is 1987043263. The next prime is 1987043291. The reversal of 1987043264 is 4623407891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987043263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76277 + ... + 98955.

It is an arithmetic number, because the mean of its divisors is an integer number (96492060).

Almost surely, 2^1987043264 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 1987043264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2026333260).

1987043264 is an abundant number, since it is smaller than the sum of its proper divisors (2065623256).

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

1987043264 is an equidigital number, since it uses as much as digits as its factorization.

1987043264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22765 (or 22718 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1987043264 is about 44576.2634593794. The cubic root of 1987043264 is about 1257.1944092594.

The spelling of 1987043264 in words is "one billion, nine hundred eighty-seven million, forty-three thousand, two hundred sixty-four".