68649040 has 20 divisors (see below), whose sum is σ = 159609204. Its totient is φ = 27459584.

The previous prime is 68649019. The next prime is 68649059. The reversal of 68649040 is 4094686.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 49674304 = 4356^2 + 7048^2 .

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

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, 428977 + ... + 429136.

Almost surely, 2^68649040 is an apocalyptic number.

It is an amenable number.

68649040 is an abundant number, since it is smaller than the sum of its proper divisors (90960164).

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

68649040 is a wasteful number, since it uses less digits than its factorization.

68649040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858126 (or 858120 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 68649040 is about 8285.4716220623. The cubic root of 68649040 is about 409.4600069377.

The spelling of 68649040 in words is "sixty-eight million, six hundred forty-nine thousand, forty".