67621988 has 48 divisors (see below), whose sum is σ = 150756480. Its totient is φ = 25837056.

The previous prime is 67621987. The next prime is 67621999. The reversal of 67621988 is 88912676.

It is a super-2 number, since 2×67621988² = 9145466522144288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67621987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5306 + ... + 12782.

It is an arithmetic number, because the mean of its divisors is an integer number (3140760).

Almost surely, 2^67621988 is an apocalyptic number.

67621988 is a gapful number since it is divisible by the number (68) 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 67621988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75378240).

67621988 is an abundant number, since it is smaller than the sum of its proper divisors (83134492).

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

67621988 is a wasteful number, since it uses less digits than its factorization.

67621988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7524 (or 7522 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 67621988 is about 8223.2589646684. The cubic root of 67621988 is about 407.4077736762.

The spelling of 67621988 in words is "sixty-seven million, six hundred twenty-one thousand, nine hundred eighty-eight".