516815690 has 16 divisors (see below), whose sum is σ = 930546792. Its totient is φ = 206664384.

The previous prime is 516815683. The next prime is 516815693. The reversal of 516815690 is 96518615.

It can be written as a sum of positive squares in 4 ways, for example, as 208426969 + 308388721 = 14437^2 + 17561^2 .

It is a super-2 number, since 2×516815690² = 534196914860352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (516815693) 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 in 7 ways as a sum of consecutive naturals, for example, 43472 + ... + 54068.

Almost surely, 2^516815690 is an apocalyptic number.

516815690 is a deficient number, since it is larger than the sum of its proper divisors (413731102).

516815690 is a wasteful number, since it uses less digits than its factorization.

516815690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15481.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 516815690 is about 22733.5806682537. The cubic root of 516815690 is about 802.5003490518.

The spelling of 516815690 in words is "five hundred sixteen million, eight hundred fifteen thousand, six hundred ninety".