67223640 has 128 divisors (see below), whose sum is σ = 222289920. Its totient is φ = 16128000.

The previous prime is 67223633. The next prime is 67223669. The reversal of 67223640 is 4632276.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 67223598 and 67223607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167440 + ... + 167840.

It is an arithmetic number, because the mean of its divisors is an integer number (1736640).

Almost surely, 2^67223640 is an apocalyptic number.

67223640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67223640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111144960).

67223640 is an abundant number, since it is smaller than the sum of its proper divisors (155066280).

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

67223640 is a wasteful number, since it uses less digits than its factorization.

67223640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 67223640 is about 8199.0023783385. The cubic root of 67223640 is about 406.6062109658.

It can be divided in two parts, 672236 and 40, that added together give a palindrome (672276).

The spelling of 67223640 in words is "sixty-seven million, two hundred twenty-three thousand, six hundred forty".