68830640 has 20 divisors (see below), whose sum is σ = 160031424. Its totient is φ = 27532224.

The previous prime is 68830621. The next prime is 68830649. The reversal of 68830640 is 4603886.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 68830640.

It is not an unprimeable number, because it can be changed into a prime (68830649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430112 + ... + 430271.

Almost surely, 2^68830640 is an apocalyptic number.

It is an amenable number.

68830640 is an abundant number, since it is smaller than the sum of its proper divisors (91200784).

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

68830640 is a wasteful number, since it uses less digits than its factorization.

68830640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860396 (or 860390 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 68830640 is about 8296.4233257471. The cubic root of 68830640 is about 409.8207425776.

The spelling of 68830640 in words is "sixty-eight million, eight hundred thirty thousand, six hundred forty".