1987895520 has 768 divisors, whose sum is σ = 8331724800. Its totient is φ = 443418624.

The previous prime is 1987895513. The next prime is 1987895531. The reversal of 1987895520 is 255987891.

1987895520 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 89 + 552 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 86430229 + ... + 86430251.

It is an arithmetic number, because the mean of its divisors is an integer number (10848600).

Almost surely, 2^1987895520 is an apocalyptic number.

1987895520 is a gapful number since it is divisible by the number (10) 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 1987895520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4165862400).

1987895520 is an abundant number, since it is smaller than the sum of its proper divisors (6343829280).

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

1987895520 is a wasteful number, since it uses less digits than its factorization.

1987895520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 54.

The square root of 1987895520 is about 44585.8219616954. The cubic root of 1987895520 is about 1257.3741232345.

The spelling of 1987895520 in words is "one billion, nine hundred eighty-seven million, eight hundred ninety-five thousand, five hundred twenty".