513999978 has 8 divisors (see below), whose sum is σ = 1027999968. Its totient is φ = 171333324.

The previous prime is 513999977. The next prime is 513999979. The reversal of 513999978 is 879999315.

It is an interprime number because it is at equal distance from previous prime (513999977) and next prime (513999979).

It is a sphenic number, since it is the product of 3 distinct primes.

513999978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (513999971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42833326 + ... + 42833337.

It is an arithmetic number, because the mean of its divisors is an integer number (128499996).

Almost surely, 2^513999978 is an apocalyptic number.

513999978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

513999978 is a wasteful number, since it uses less digits than its factorization.

513999978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85666668.

The product of its digits is 5511240, while the sum is 60.

The square root of 513999978 is about 22671.5676123201. The cubic root of 513999978 is about 801.0403018371.

The spelling of 513999978 in words is "five hundred thirteen million, nine hundred ninety-nine thousand, nine hundred seventy-eight".