67870728 has 96 divisors (see below), whose sum is σ = 191919000. Its totient is φ = 21648384.

The previous prime is 67870697. The next prime is 67870729. The reversal of 67870728 is 82707876.

It can be written as a sum of positive squares in 4 ways, for example, as 67864644 + 6084 = 8238^2 + 78^2 .

It is not an unprimeable number, because it can be changed into a prime (67870729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194298 + ... + 194646.

Almost surely, 2^67870728 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 67870728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95959500).

67870728 is an abundant number, since it is smaller than the sum of its proper divisors (124048272).

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

67870728 is a wasteful number, since it uses less digits than its factorization.

67870728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 67870728 is about 8238.3692561089. The cubic root of 67870728 is about 407.9066972346.

The spelling of 67870728 in words is "sixty-seven million, eight hundred seventy thousand, seven hundred twenty-eight".