987256823944 has 8 divisors (see below), whose sum is σ = 1851106544910. Its totient is φ = 493628411968.

The previous prime is 987256823941. The next prime is 987256823947. The reversal of 987256823944 is 449328652789.

It is an interprime number because it is at equal distance from previous prime (987256823941) and next prime (987256823947).

It can be written as a sum of positive squares in only one way, i.e., 535487332900 + 451769491044 = 731770^2 + 672138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 987256823944.

It is not an unprimeable number, because it can be changed into a prime (987256823941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61703551489 + ... + 61703551504.

Almost surely, 2^987256823944 is an apocalyptic number.

It is an amenable number.

987256823944 is a deficient number, since it is larger than the sum of its proper divisors (863849720966).

987256823944 is a wasteful number, since it uses less digits than its factorization.

987256823944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123407102999 (or 123407102995 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 67.

The spelling of 987256823944 in words is "nine hundred eighty-seven billion, two hundred fifty-six million, eight hundred twenty-three thousand, nine hundred forty-four".