634542678 has 96 divisors (see below), whose sum is σ = 1773308160. Its totient is φ = 159122880.

The previous prime is 634542631. The next prime is 634542703. The reversal of 634542678 is 876245436.

634542678 is a `hidden beast` number, since 6 + 34 + 542 + 6 + 78 = 666.

634542678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32301 + ... + 48087.

It is an arithmetic number, because the mean of its divisors is an integer number (18471960).

Almost surely, 2^634542678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634542678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886654080).

634542678 is an abundant number, since it is smaller than the sum of its proper divisors (1138765482).

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

634542678 is a wasteful number, since it uses less digits than its factorization.

634542678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842 (or 15839 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 634542678 is about 25190.1305673472. The cubic root of 634542678 is about 859.3174131206.

The spelling of 634542678 in words is "six hundred thirty-four million, five hundred forty-two thousand, six hundred seventy-eight".