68669640 has 256 divisors, whose sum is σ = 253612800. Its totient is φ = 16422912.

The previous prime is 68669561. The next prime is 68669663. The reversal of 68669640 is 4696686.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 940644 + ... + 940716.

It is an arithmetic number, because the mean of its divisors is an integer number (990675).

Almost surely, 2^68669640 is an apocalyptic number.

68669640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68669640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126806400).

68669640 is an abundant number, since it is smaller than the sum of its proper divisors (184943160).

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

68669640 is a wasteful number, since it uses less digits than its factorization.

68669640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 68669640 is about 8286.7146686730. The cubic root of 68669640 is about 409.5009593559.

The spelling of 68669640 in words is "sixty-eight million, six hundred sixty-nine thousand, six hundred forty".