68400734436 has 36 divisors (see below), whose sum is σ = 177118978764. Its totient is φ = 22244140800.

The previous prime is 68400734419. The next prime is 68400734447. The reversal of 68400734436 is 63443700486.

It can be written as a sum of positive squares in 2 ways, for example, as 35732340900 + 32668393536 = 189030^2 + 180744^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 68400734391 and 68400734400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23169505 + ... + 23172456.

Almost surely, 2^68400734436 is an apocalyptic number.

It is an amenable number.

68400734436 is an abundant number, since it is smaller than the sum of its proper divisors (108718244328).

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

68400734436 is a wasteful number, since it uses less digits than its factorization.

68400734436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46342012 (or 46342007 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The spelling of 68400734436 in words is "sixty-eight billion, four hundred million, seven hundred thirty-four thousand, four hundred thirty-six".