634778135852 has 24 divisors (see below), whose sum is σ = 1274496193824. Its totient is φ = 270989217792.

The previous prime is 634778135791. The next prime is 634778135861. The reversal of 634778135852 is 258531877436.

It is a junction number, because it is equal to n+sod(n) for n = 634778135791 and 634778135800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44099123 + ... + 44113514.

It is an arithmetic number, because the mean of its divisors is an integer number (53104008076).

Almost surely, 2^634778135852 is an apocalyptic number.

It is an amenable number.

634778135852 is an abundant number, since it is smaller than the sum of its proper divisors (639718057972).

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

634778135852 is a wasteful number, since it uses less digits than its factorization.

634778135852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88212905 (or 88212903 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 59.

The spelling of 634778135852 in words is "six hundred thirty-four billion, seven hundred seventy-eight million, one hundred thirty-five thousand, eight hundred fifty-two".