513638646 has 16 divisors (see below), whose sum is σ = 1087705584. Its totient is φ = 161141504.

The previous prime is 513638641. The next prime is 513638677. The reversal of 513638646 is 646836315.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 513638598 and 513638607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513638641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2517735 + ... + 2517938.

It is an arithmetic number, because the mean of its divisors is an integer number (67981599).

Almost surely, 2^513638646 is an apocalyptic number.

513638646 is an abundant number, since it is smaller than the sum of its proper divisors (574066938).

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

513638646 is a wasteful number, since it uses less digits than its factorization.

513638646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035695.

The product of its digits is 311040, while the sum is 42.

The square root of 513638646 is about 22663.5973755271. The cubic root of 513638646 is about 800.8525525782.

The spelling of 513638646 in words is "five hundred thirteen million, six hundred thirty-eight thousand, six hundred forty-six".