67540816 has 80 divisors (see below), whose sum is σ = 157926400. Its totient is φ = 27941760.

The previous prime is 67540793. The next prime is 67540867. The reversal of 67540816 is 61804576.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169930 + ... + 170326.

It is an arithmetic number, because the mean of its divisors is an integer number (1974080).

Almost surely, 2^67540816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67540816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78963200).

67540816 is an abundant number, since it is smaller than the sum of its proper divisors (90385584).

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

67540816 is a wasteful number, since it uses less digits than its factorization.

67540816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 67540816 is about 8218.3219698427. The cubic root of 67540816 is about 407.2446938564.

The spelling of 67540816 in words is "sixty-seven million, five hundred forty thousand, eight hundred sixteen".