68434728 has 16 divisors (see below), whose sum is σ = 171086880. Its totient is φ = 22811568.

The previous prime is 68434703. The next prime is 68434747. The reversal of 68434728 is 82743486.

It is a self number, because there is not a number n which added to its sum of digits gives 68434728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1425700 + ... + 1425747.

It is an arithmetic number, because the mean of its divisors is an integer number (10692930).

Almost surely, 2^68434728 is an apocalyptic number.

It is an amenable number.

68434728 is an abundant number, since it is smaller than the sum of its proper divisors (102652152).

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

68434728 is a wasteful number, since it uses less digits than its factorization.

68434728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851456 (or 2851452 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 68434728 is about 8272.5285130968. The cubic root of 68434728 is about 409.0334718732.

The spelling of 68434728 in words is "sixty-eight million, four hundred thirty-four thousand, seven hundred twenty-eight".