5211781678 has 8 divisors (see below), whose sum is σ = 7820312760. Its totient is φ = 2605010760.

The previous prime is 5211781651. The next prime is 5211781691. The reversal of 5211781678 is 8761871125.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432613 + ... + 444496.

It is an arithmetic number, because the mean of its divisors is an integer number (977539095).

Almost surely, 2^5211781678 is an apocalyptic number.

5211781678 is a deficient number, since it is larger than the sum of its proper divisors (2608531082).

5211781678 is a wasteful number, since it uses less digits than its factorization.

5211781678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880082.

The product of its digits is 188160, while the sum is 46.

The square root of 5211781678 is about 72192.6705282468. The cubic root of 5211781678 is about 1733.7856532651.

The spelling of 5211781678 in words is "five billion, two hundred eleven million, seven hundred eighty-one thousand, six hundred seventy-eight".