516878138 has 8 divisors (see below), whose sum is σ = 886076832. Its totient is φ = 221519196.

The previous prime is 516878137. The next prime is 516878171. The reversal of 516878138 is 831878615.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 516878092 and 516878101.

It is not an unprimeable number, because it can be changed into a prime (516878137) 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, 18459920 + ... + 18459947.

It is an arithmetic number, because the mean of its divisors is an integer number (110759604).

Almost surely, 2^516878138 is an apocalyptic number.

516878138 is a deficient number, since it is larger than the sum of its proper divisors (369198694).

516878138 is a wasteful number, since it uses less digits than its factorization.

516878138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36919876.

The product of its digits is 322560, while the sum is 47.

The square root of 516878138 is about 22734.9541015591. The cubic root of 516878138 is about 802.5326703896.

The spelling of 516878138 in words is "five hundred sixteen million, eight hundred seventy-eight thousand, one hundred thirty-eight".