987640844 has 6 divisors (see below), whose sum is σ = 1728371484. Its totient is φ = 493820420.

The previous prime is 987640837. The next prime is 987640853. The reversal of 987640844 is 448046789.

987640844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 987640792 and 987640801.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123455102 + ... + 123455109.

It is an arithmetic number, because the mean of its divisors is an integer number (288061914).

Almost surely, 2^987640844 is an apocalyptic number.

It is an amenable number.

987640844 is a deficient number, since it is larger than the sum of its proper divisors (740730640).

987640844 is a wasteful number, since it uses less digits than its factorization.

987640844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246910215 (or 246910213 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 987640844 is about 31426.7536344434. The cubic root of 987640844 is about 995.8631917488.

The spelling of 987640844 in words is "nine hundred eighty-seven million, six hundred forty thousand, eight hundred forty-four".