67312728 has 64 divisors (see below), whose sum is σ = 213696000. Its totient is φ = 19231776.

The previous prime is 67312723. The next prime is 67312753. The reversal of 67312728 is 82721376.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 67312692 and 67312701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67312723) 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, 20748 + ... + 23771.

It is an arithmetic number, because the mean of its divisors is an integer number (3339000).

Almost surely, 2^67312728 is an apocalyptic number.

It is an amenable number.

67312728 is an abundant number, since it is smaller than the sum of its proper divisors (146383272).

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

67312728 is a wasteful number, since it uses less digits than its factorization.

67312728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44541 (or 44531 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 67312728 is about 8204.4334356493. The cubic root of 67312728 is about 406.7857497118.

The spelling of 67312728 in words is "sixty-seven million, three hundred twelve thousand, seven hundred twenty-eight".