68610728 has 32 divisors (see below), whose sum is σ = 132917160. Its totient is φ = 33177600.

The previous prime is 68610721. The next prime is 68610733. The reversal of 68610728 is 82701686.

It can be written as a sum of positive squares in 4 ways, for example, as 41964484 + 26646244 = 6478^2 + 5162^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68610691 and 68610700.

It is not an unprimeable number, because it can be changed into a prime (68610721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56528 + ... + 57728.

Almost surely, 2^68610728 is an apocalyptic number.

It is an amenable number.

68610728 is a deficient number, since it is larger than the sum of its proper divisors (64306432).

68610728 is a wasteful number, since it uses less digits than its factorization.

68610728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 68610728 is about 8283.1593006533. The cubic root of 68610728 is about 409.3838215996.

The spelling of 68610728 in words is "sixty-eight million, six hundred ten thousand, seven hundred twenty-eight".