67840816 has 20 divisors (see below), whose sum is σ = 131656752. Its totient is φ = 33864896.

The previous prime is 67840813. The next prime is 67840819. The reversal of 67840816 is 61804876.

It is an interprime number because it is at equal distance from previous prime (67840813) and next prime (67840819).

It is not an unprimeable number, because it can be changed into a prime (67840813) 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, 7701 + ... + 13963.

Almost surely, 2^67840816 is an apocalyptic number.

It is an amenable number.

67840816 is a deficient number, since it is larger than the sum of its proper divisors (63815936).

67840816 is a wasteful number, since it uses less digits than its factorization.

67840816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948 (or 6942 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 67840816 is about 8236.5536482196. The cubic root of 67840816 is about 407.8467641904.

The spelling of 67840816 in words is "sixty-seven million, eight hundred forty thousand, eight hundred sixteen".