67721936 has 40 divisors (see below), whose sum is σ = 137878080. Its totient is φ = 32161536.

The previous prime is 67721921. The next prime is 67721957. The reversal of 67721936 is 63912776.

Its product of digits (95256) is a multiple of the sum of its prime factors (1323).

It is a junction number, because it is equal to n+sod(n) for n = 67721893 and 67721902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59420 + ... + 60548.

It is an arithmetic number, because the mean of its divisors is an integer number (3446952).

Almost surely, 2^67721936 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 67721936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68939040).

67721936 is an abundant number, since it is smaller than the sum of its proper divisors (70156144).

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

67721936 is a wasteful number, since it uses less digits than its factorization.

67721936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1317 counting only the distinct ones).

The product of its digits is 95256, while the sum is 41.

The square root of 67721936 is about 8229.3338734068. Note that the first 3 decimals coincide. The cubic root of 67721936 is about 407.6083965214.

The spelling of 67721936 in words is "sixty-seven million, seven hundred twenty-one thousand, nine hundred thirty-six".