987173396356 has 27 divisors (see below), whose sum is σ = 2009631302469. Its totient is φ = 423068351328.

The previous prime is 987173396329. The next prime is 987173396357. The reversal of 987173396356 is 653693371789.

The square root of 987173396356 is 993566.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 76599418756 + 910573977600 = 276766^2 + 954240^2 .

It is a super-2 number, since 2×987173396356² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 987173396291 and 987173396300.

It is not an unprimeable number, because it can be changed into a prime (987173396357) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13874440 + ... + 13945408.

Almost surely, 2^987173396356 is an apocalyptic number.

987173396356 is the 993566-th square number.

It is an amenable number.

987173396356 is an abundant number, since it is smaller than the sum of its proper divisors (1022457906113).

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

987173396356 is an frugal number, since it uses more digits than its factorization.

987173396356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141956 (or 70978 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 67.

The spelling of 987173396356 in words is "nine hundred eighty-seven billion, one hundred seventy-three million, three hundred ninety-six thousand, three hundred fifty-six".