67660638 has 8 divisors (see below), whose sum is σ = 135321288. Its totient is φ = 22553544.

The previous prime is 67660633. The next prime is 67660639. The reversal of 67660638 is 83606676.

It is a sphenic number, since it is the product of 3 distinct primes.

67660638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 67660638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67660633) 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, 5638381 + ... + 5638392.

It is an arithmetic number, because the mean of its divisors is an integer number (16915161).

Almost surely, 2^67660638 is an apocalyptic number.

67660638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

67660638 is a wasteful number, since it uses less digits than its factorization.

67660638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11276778.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 67660638 is about 8225.6086704876. The cubic root of 67660638 is about 407.4853781748.

The spelling of 67660638 in words is "sixty-seven million, six hundred sixty thousand, six hundred thirty-eight".