67221406 has 16 divisors (see below), whose sum is σ = 115614720. Its totient is φ = 28714680.

The previous prime is 67221403. The next prime is 67221419. The reversal of 67221406 is 60412276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67221403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3366 + ... + 12073.

It is an arithmetic number, because the mean of its divisors is an integer number (7225920).

Almost surely, 2^67221406 is an apocalyptic number.

67221406 is a deficient number, since it is larger than the sum of its proper divisors (48393314).

67221406 is a wasteful number, since it uses less digits than its factorization.

67221406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15759.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 67221406 is about 8198.8661411198. The cubic root of 67221406 is about 406.6017067550.

It can be divided in two parts, 6722 and 1406, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 67221406 in words is "sixty-seven million, two hundred twenty-one thousand, four hundred six".