1987622970 has 128 divisors (see below), whose sum is σ = 5260197888. Its totient is φ = 479001600.

The previous prime is 1987622951. The next prime is 1987622999. The reversal of 1987622970 is 792267891.

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 918690 + ... + 920850.

It is an arithmetic number, because the mean of its divisors is an integer number (41095296).

Almost surely, 2^1987622970 is an apocalyptic number.

1987622970 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 1987622970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630098944).

1987622970 is an abundant number, since it is smaller than the sum of its proper divisors (3272574918).

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

1987622970 is a wasteful number, since it uses less digits than its factorization.

1987622970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 1987622970 is about 44582.7653920212. The cubic root of 1987622970 is about 1257.3166566026.

The spelling of 1987622970 in words is "one billion, nine hundred eighty-seven million, six hundred twenty-two thousand, nine hundred seventy".