67876721 has 16 divisors (see below), whose sum is σ = 78950400. Its totient is φ = 57704400.

The previous prime is 67876709. The next prime is 67876741. The reversal of 67876721 is 12767876.

It is a cyclic number.

It is not a de Polignac number, because 67876721 - 2²⁶ = 767857 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67876741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14456 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (4934400).

Almost surely, 2^67876721 is an apocalyptic number.

It is an amenable number.

67876721 is a deficient number, since it is larger than the sum of its proper divisors (11073679).

67876721 is a wasteful number, since it uses less digits than its factorization.

67876721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220.

The product of its digits is 197568, while the sum is 44.

The square root of 67876721 is about 8238.7329729759. The cubic root of 67876721 is about 407.9187029645.

The spelling of 67876721 in words is "sixty-seven million, eight hundred seventy-six thousand, seven hundred twenty-one".