1987147890 has 160 divisors (see below), whose sum is σ = 6576514560. Its totient is φ = 419250816.

The previous prime is 1987147849. The next prime is 1987147913. The reversal of 1987147890 is 987417891.

1987147890 is a `hidden beast` number, since 1 + 9 + 87 + 1 + 478 + 90 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 60231 + ... + 87189.

It is an arithmetic number, because the mean of its divisors is an integer number (41103216).

Almost surely, 2^1987147890 is an apocalyptic number.

1987147890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987147890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3288257280).

1987147890 is an abundant number, since it is smaller than the sum of its proper divisors (4589366670).

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

1987147890 is a wasteful number, since it uses less digits than its factorization.

1987147890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26998 (or 26989 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1987147890 is about 44577.4370057319. The cubic root of 1987147890 is about 1257.2164743575.

The spelling of 1987147890 in words is "one billion, nine hundred eighty-seven million, one hundred forty-seven thousand, eight hundred ninety".