67721742 has 48 divisors (see below), whose sum is σ = 160617600. Its totient is φ = 20451600.

The previous prime is 67721741. The next prime is 67721743. The reversal of 67721742 is 24712776.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67721741) and next prime (67721743).

It is a super-3 number, since 3×67721742³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67721697 and 67721706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67721741) 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, 112759 + ... + 113357.

It is an arithmetic number, because the mean of its divisors is an integer number (3346200).

Almost surely, 2^67721742 is an apocalyptic number.

67721742 is an abundant number, since it is smaller than the sum of its proper divisors (92895858).

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

67721742 is a wasteful number, since it uses less digits than its factorization.

67721742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1186 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 67721742 is about 8229.3220862961. The cubic root of 67721742 is about 407.6080073019.

The spelling of 67721742 in words is "sixty-seven million, seven hundred twenty-one thousand, seven hundred forty-two".