516997988 has 12 divisors (see below), whose sum is σ = 974342460. Its totient is φ = 238614432.

The previous prime is 516997981. The next prime is 516997991. The reversal of 516997988 is 889799615.

It can be written as a sum of positive squares in 2 ways, for example, as 192709924 + 324288064 = 13882^2 + 18008^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 516997988.

It is not an unprimeable number, because it can be changed into a prime (516997981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4971083 + ... + 4971186.

It is an arithmetic number, because the mean of its divisors is an integer number (81195205).

Almost surely, 2^516997988 is an apocalyptic number.

It is an amenable number.

516997988 is a deficient number, since it is larger than the sum of its proper divisors (457344472).

516997988 is a wasteful number, since it uses less digits than its factorization.

516997988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942286 (or 9942284 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 62.

The square root of 516997988 is about 22737.5897579317. The cubic root of 516997988 is about 802.5946941049.

The spelling of 516997988 in words is "five hundred sixteen million, nine hundred ninety-seven thousand, nine hundred eighty-eight".