1987615380 has 48 divisors (see below), whose sum is σ = 5807297664. Its totient is φ = 506985600.

The previous prime is 1987615361. The next prime is 1987615397. The reversal of 1987615380 is 835167891.

It is a super-2 number, since 2×1987615380² = 7901229797625088800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 718771 + ... + 721530.

It is an arithmetic number, because the mean of its divisors is an integer number (120985368).

Almost surely, 2^1987615380 is an apocalyptic number.

1987615380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987615380 is an abundant number, since it is smaller than the sum of its proper divisors (3819682284).

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

1987615380 is a wasteful number, since it uses less digits than its factorization.

1987615380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440336 (or 1440334 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1987615380 is about 44582.6802693602. The cubic root of 1987615380 is about 1257.3150561908.

The spelling of 1987615380 in words is "one billion, nine hundred eighty-seven million, six hundred fifteen thousand, three hundred eighty".