1987886264 has 64 divisors (see below), whose sum is σ = 4674075840. Its totient is φ = 771563520.

The previous prime is 1987886261. The next prime is 1987886269. The reversal of 1987886264 is 4626887891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987886261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12824 + ... + 64344.

It is an arithmetic number, because the mean of its divisors is an integer number (73032435).

Almost surely, 2^1987886264 is an apocalyptic number.

1987886264 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 1987886264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2337037920).

1987886264 is an abundant number, since it is smaller than the sum of its proper divisors (2686189576).

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

1987886264 is a wasteful number, since it uses less digits than its factorization.

1987886264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51600 (or 51596 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 59.

The square root of 1987886264 is about 44585.7181617612. The cubic root of 1987886264 is about 1257.3721717112.

The spelling of 1987886264 in words is "one billion, nine hundred eighty-seven million, eight hundred eighty-six thousand, two hundred sixty-four".