67840344 has 144 divisors (see below), whose sum is σ = 217854000. Its totient is φ = 18944640.

The previous prime is 67840337. The next prime is 67840349. The reversal of 67840344 is 44304876.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 67840299 and 67840308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67840349) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 112957 + ... + 113555.

It is an arithmetic number, because the mean of its divisors is an integer number (1512875).

Almost surely, 2^67840344 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 67840344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108927000).

67840344 is an abundant number, since it is smaller than the sum of its proper divisors (150013656).

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

67840344 is a wasteful number, since it uses less digits than its factorization.

67840344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 67840344 is about 8236.5249954092. The cubic root of 67840344 is about 407.8458183286.

The spelling of 67840344 in words is "sixty-seven million, eight hundred forty thousand, three hundred forty-four".