1987563970 has 144 divisors (see below), whose sum is σ = 4525562880. Its totient is φ = 624879360.

The previous prime is 1987563953. The next prime is 1987563979. The reversal of 1987563970 is 793657891.

It is not an unprimeable number, because it can be changed into a prime (1987563979) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15650047 + ... + 15650173.

It is an arithmetic number, because the mean of its divisors is an integer number (31427520).

Almost surely, 2^1987563970 is an apocalyptic number.

1987563970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987563970 is an abundant number, since it is smaller than the sum of its proper divisors (2537998910).

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

1987563970 is a wasteful number, since it uses less digits than its factorization.

1987563970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The square root of 1987563970 is about 44582.1036964386. The cubic root of 1987563970 is about 1257.3042158768.

It can be divided in two parts, 19875 and 63970, that added together give a triangular number (83845 = T₄₀₉).

The spelling of 1987563970 in words is "one billion, nine hundred eighty-seven million, five hundred sixty-three thousand, nine hundred seventy".