68704640 has 32 divisors (see below), whose sum is σ = 164248560. Its totient is φ = 27481600.

The previous prime is 68704639. The next prime is 68704651. The reversal of 68704640 is 4640786.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 68704640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53036 + ... + 54315.

Almost surely, 2^68704640 is an apocalyptic number.

It is an amenable number.

68704640 is an abundant number, since it is smaller than the sum of its proper divisors (95543920).

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

68704640 is a wasteful number, since it uses less digits than its factorization.

68704640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107370 (or 107358 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 68704640 is about 8288.8262136445. The cubic root of 68704640 is about 409.5705199323.

The spelling of 68704640 in words is "sixty-eight million, seven hundred four thousand, six hundred forty".