1987977216 has 112 divisors (see below), whose sum is σ = 5532997824. Its totient is φ = 633667584.

The previous prime is 1987977191. The next prime is 1987977217. The reversal of 1987977216 is 6127797891.

It is a super-2 number, since 2×1987977216² = 7904106822670221312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1987977217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563490 + ... + 567006.

Almost surely, 2^1987977216 is an apocalyptic number.

1987977216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987977216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2766498912).

1987977216 is an abundant number, since it is smaller than the sum of its proper divisors (3545020608).

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

1987977216 is an equidigital number, since it uses as much as digits as its factorization.

1987977216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569 (or 3545 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 57.

The square root of 1987977216 is about 44586.7381179651. The cubic root of 1987977216 is about 1257.3913476523.

The spelling of 1987977216 in words is "one billion, nine hundred eighty-seven million, nine hundred seventy-seven thousand, two hundred sixteen".