68456728 has 8 divisors (see below), whose sum is σ = 128356380. Its totient is φ = 34228360.

The previous prime is 68456723. The next prime is 68456737. The reversal of 68456728 is 82765486.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68456723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278538 + ... + 4278553.

Almost surely, 2^68456728 is an apocalyptic number.

It is an amenable number.

68456728 is a deficient number, since it is larger than the sum of its proper divisors (59899652).

68456728 is a wasteful number, since it uses less digits than its factorization.

68456728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8557097 (or 8557093 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 68456728 is about 8273.8581085247. The cubic root of 68456728 is about 409.0772984144.

The spelling of 68456728 in words is "sixty-eight million, four hundred fifty-six thousand, seven hundred twenty-eight".