67640416 has 24 divisors (see below), whose sum is σ = 141001560. Its totient is φ = 31830528.

The previous prime is 67640411. The next prime is 67640423. The reversal of 67640416 is 61404676.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61626 + ... + 62713.

It is an arithmetic number, because the mean of its divisors is an integer number (5875065).

Almost surely, 2^67640416 is an apocalyptic number.

It is an amenable number.

67640416 is an abundant number, since it is smaller than the sum of its proper divisors (73361144).

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

67640416 is a wasteful number, since it uses less digits than its factorization.

67640416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124366 (or 124358 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 67640416 is about 8224.3793686819. The cubic root of 67640416 is about 407.4447785460. Note that the first 3 decimals are identical.

The spelling of 67640416 in words is "sixty-seven million, six hundred forty thousand, four hundred sixteen".