1987860544 has 42 divisors (see below), whose sum is σ = 3972092894. Its totient is φ = 987048960.

The previous prime is 1987860533. The next prime is 1987860569. The reversal of 1987860544 is 4450687891.

It can be written as a sum of positive squares in only one way, i.e., 1855886400 + 131974144 = 43080^2 + 11488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1987860491 and 1987860500.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5537037 + ... + 5537395.

Almost surely, 2^1987860544 is an apocalyptic number.

It is an amenable number.

1987860544 is a deficient number, since it is larger than the sum of its proper divisors (1984232350).

1987860544 is an frugal number, since it uses more digits than its factorization.

1987860544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 1987860544 is about 44585.4297276588. The cubic root of 1987860544 is about 1257.3667489074.

The spelling of 1987860544 in words is "one billion, nine hundred eighty-seven million, eight hundred sixty thousand, five hundred forty-four".