511997678 has 4 divisors (see below), whose sum is σ = 767996520. Its totient is φ = 255998838.

The previous prime is 511997671. The next prime is 511997683. The reversal of 511997678 is 876799115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876799115 = 5 ⋅175359823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511997671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127999418 + ... + 127999421.

It is an arithmetic number, because the mean of its divisors is an integer number (191999130).

Almost surely, 2^511997678 is an apocalyptic number.

511997678 is a deficient number, since it is larger than the sum of its proper divisors (255998842).

511997678 is a wasteful number, since it uses less digits than its factorization.

511997678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255998841.

The product of its digits is 952560, while the sum is 53.

The square root of 511997678 is about 22627.3656884755. The cubic root of 511997678 is about 799.9987906232.

The spelling of 511997678 in words is "five hundred eleven million, nine hundred ninety-seven thousand, six hundred seventy-eight".