67221240 has 64 divisors (see below), whose sum is σ = 212284800. Its totient is φ = 16981632.

The previous prime is 67221229. The next prime is 67221241. The reversal of 67221240 is 4212276.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 67221240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67221241) 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, 12462 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (3316950).

Almost surely, 2^67221240 is an apocalyptic number.

67221240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67221240 is an abundant number, since it is smaller than the sum of its proper divisors (145063560).

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

67221240 is a wasteful number, since it uses less digits than its factorization.

67221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29516 (or 29512 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 67221240 is about 8198.8560177625. The cubic root of 67221240 is about 406.6013720603.

It can be divided in two parts, 672 and 21240, that added together give a palindrome (21912).

The spelling of 67221240 in words is "sixty-seven million, two hundred twenty-one thousand, two hundred forty".