67221440 has 168 divisors, whose sum is σ = 190762128. Its totient is φ = 22364160.

The previous prime is 67221431. The next prime is 67221443. The reversal of 67221440 is 4412276.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67221443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 594824 + ... + 594936.

Almost surely, 2^67221440 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 67221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95381064).

67221440 is an abundant number, since it is smaller than the sum of its proper divisors (123540688).

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

67221440 is a wasteful number, since it uses less digits than its factorization.

67221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 67221440 is about 8198.8682145769. The cubic root of 67221440 is about 406.6017753069.

The spelling of 67221440 in words is "sixty-seven million, two hundred twenty-one thousand, four hundred forty".