67879728 has 80 divisors (see below), whose sum is σ = 222684160. Its totient is φ = 19393344.

The previous prime is 67879711. The next prime is 67879733. The reversal of 67879728 is 82797876.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8200 + ... + 14247.

It is an arithmetic number, because the mean of its divisors is an integer number (2783552).

Almost surely, 2^67879728 is an apocalyptic number.

It is an amenable number.

67879728 is an abundant number, since it is smaller than the sum of its proper divisors (154804432).

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

67879728 is a wasteful number, since it uses less digits than its factorization.

67879728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22471 (or 22459 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 67879728 is about 8238.9154626079. The cubic root of 67879728 is about 407.9247265978.

The spelling of 67879728 in words is "sixty-seven million, eight hundred seventy-nine thousand, seven hundred twenty-eight".