634398893436 has 96 divisors (see below), whose sum is σ = 1942656952320. Its totient is φ = 156106353600.

The previous prime is 634398893407. The next prime is 634398893437.

634398893436 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634398893437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18050310 + ... + 18085421.

It is an arithmetic number, because the mean of its divisors is an integer number (20236009920).

Almost surely, 2^634398893436 is an apocalyptic number.

634398893436 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

634398893436 is an abundant number, since it is smaller than the sum of its proper divisors (1308258058884).

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

634398893436 is a wasteful number, since it uses less digits than its factorization.

634398893436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36135775 (or 36135773 counting only the distinct ones).

The product of its digits is 241864704, while the sum is 66.

The spelling of 634398893436 in words is "six hundred thirty-four billion, three hundred ninety-eight million, eight hundred ninety-three thousand, four hundred thirty-six".