67297728 has 112 divisors (see below), whose sum is σ = 186391296. Its totient is φ = 21411840.

The previous prime is 67297721. The next prime is 67297729. The reversal of 67297728 is 82779276.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67297721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653325 + ... + 653427.

It is an arithmetic number, because the mean of its divisors is an integer number (1664208).

Almost surely, 2^67297728 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 67297728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93195648).

67297728 is an abundant number, since it is smaller than the sum of its proper divisors (119093568).

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

67297728 is a wasteful number, since it uses less digits than its factorization.

67297728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 232 counting only the distinct ones).

The product of its digits is 592704, while the sum is 48.

The square root of 67297728 is about 8203.5192448119. The cubic root of 67297728 is about 406.7555313578.

The spelling of 67297728 in words is "sixty-seven million, two hundred ninety-seven thousand, seven hundred twenty-eight".