67665816 has 96 divisors (see below), whose sum is σ = 197964000. Its totient is φ = 20815872.

The previous prime is 67665799. The next prime is 67665841. The reversal of 67665816 is 61856676.

67665816 is a `hidden beast` number, since 6 + 7 + 66 + 581 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47320 + ... + 48728.

It is an arithmetic number, because the mean of its divisors is an integer number (2062125).

Almost surely, 2^67665816 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 67665816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98982000).

67665816 is an abundant number, since it is smaller than the sum of its proper divisors (130298184).

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

67665816 is a wasteful number, since it uses less digits than its factorization.

67665816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473 (or 1466 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 67665816 is about 8225.9234132102. The cubic root of 67665816 is about 407.4957727239.

The spelling of 67665816 in words is "sixty-seven million, six hundred sixty-five thousand, eight hundred sixteen".