617987798884 has 27 divisors (see below), whose sum is σ = 1105110553267. Its totient is φ = 302383399544.

The previous prime is 617987798881. The next prime is 617987798887. The reversal of 617987798884 is 488897789716.

The square root of 617987798884 is 786122.

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

It is an interprime number because it is at equal distance from previous prime (617987798881) and next prime (617987798887).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 617987798798 and 617987798807.

It is not an unprimeable number, because it can be changed into a prime (617987798881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 73891287 + ... + 73899649.

Almost surely, 2^617987798884 is an apocalyptic number.

617987798884 is the 786122-nd square number.

It is an amenable number.

617987798884 is a deficient number, since it is larger than the sum of its proper divisors (487122754383).

617987798884 is an frugal number, since it uses more digits than its factorization.

617987798884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16824 (or 8412 counting only the distinct ones).

The product of its digits is 2731180032, while the sum is 82.

The spelling of 617987798884 in words is "six hundred seventeen billion, nine hundred eighty-seven million, seven hundred ninety-eight thousand, eight hundred eighty-four".