67689021 has 16 divisors (see below), whose sum is σ = 92993600. Its totient is φ = 43763328.

The previous prime is 67689007. The next prime is 67689047. The reversal of 67689021 is 12098676.

It is not a de Polignac number, because 67689021 - 2¹³ = 67680829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67689221) 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, 41265 + ... + 42873.

It is an arithmetic number, because the mean of its divisors is an integer number (5812100).

Almost surely, 2^67689021 is an apocalyptic number.

It is an amenable number.

67689021 is a deficient number, since it is larger than the sum of its proper divisors (25304579).

67689021 is a wasteful number, since it uses less digits than its factorization.

67689021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 67689021 is about 8227.3337722497. Note that the first 3 decimals coincide. The cubic root of 67689021 is about 407.5423489680.

The spelling of 67689021 in words is "sixty-seven million, six hundred eighty-nine thousand, twenty-one".