1987817328 has 80 divisors (see below), whose sum is σ = 6520892160. Its totient is φ = 567946944.

The previous prime is 1987817281. The next prime is 1987817329. The reversal of 1987817328 is 8237187891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987817329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325650 + ... + 331697.

It is an arithmetic number, because the mean of its divisors is an integer number (81511152).

Almost surely, 2^1987817328 is an apocalyptic number.

1987817328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1987817328 is an abundant number, since it is smaller than the sum of its proper divisors (4533074832).

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

1987817328 is a wasteful number, since it uses less digits than its factorization.

1987817328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657371 (or 657359 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 1987817328 is about 44584.9450823930. The cubic root of 1987817328 is about 1257.3576371423.

The spelling of 1987817328 in words is "one billion, nine hundred eighty-seven million, eight hundred seventeen thousand, three hundred twenty-eight".