1987642407776 has 48 divisors (see below), whose sum is σ = 4127586140160. Its totient is φ = 939581389440.

The previous prime is 1987642407739. The next prime is 1987642407799. The reversal of 1987642407776 is 6777042467891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3060320 + ... + 3652511.

It is an arithmetic number, because the mean of its divisors is an integer number (85991377920).

Almost surely, 2^{1987642407776} is an apocalyptic number.

1987642407776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1987642407776 is an abundant number, since it is smaller than the sum of its proper divisors (2139943732384).

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

1987642407776 is a wasteful number, since it uses less digits than its factorization.

1987642407776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713347 (or 6713339 counting only the distinct ones).

The product of its (nonzero) digits is 199148544, while the sum is 68.

The spelling of 1987642407776 in words is "one trillion, nine hundred eighty-seven billion, six hundred forty-two million, four hundred seven thousand, seven hundred seventy-six".