647538678 has 16 divisors (see below), whose sum is σ = 1438974960. Its totient is φ = 215846208.

The previous prime is 647538667. The next prime is 647538691. The reversal of 647538678 is 876835746.

647538678 is a `hidden beast` number, since 6 + 47 + 538 + 67 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 11991457 = 647538678 / (6 + 4 + 7 + 5 + 3 + 8 + 6 + 7 + 8).

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 5995675 + ... + 5995782.

It is an arithmetic number, because the mean of its divisors is an integer number (89935935).

Almost surely, 2^647538678 is an apocalyptic number.

647538678 is an abundant number, since it is smaller than the sum of its proper divisors (791436282).

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

647538678 is a wasteful number, since it uses less digits than its factorization.

647538678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991468 (or 11991462 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 647538678 is about 25446.7812895855. The cubic root of 647538678 is about 865.1443411326.

The spelling of 647538678 in words is "six hundred forty-seven million, five hundred thirty-eight thousand, six hundred seventy-eight".