68721672 has 16 divisors (see below), whose sum is σ = 171804240. Its totient is φ = 22907216.

The previous prime is 68721671. The next prime is 68721721. The reversal of 68721672 is 27612786.

It is a self number, because there is not a number n which added to its sum of digits gives 68721672.

It is not an unprimeable number, because it can be changed into a prime (68721671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431678 + ... + 1431725.

It is an arithmetic number, because the mean of its divisors is an integer number (10737765).

Almost surely, 2^68721672 is an apocalyptic number.

It is an amenable number.

68721672 is an abundant number, since it is smaller than the sum of its proper divisors (103082568).

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

68721672 is a wasteful number, since it uses less digits than its factorization.

68721672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863412 (or 2863408 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 68721672 is about 8289.8535572108. The cubic root of 68721672 is about 409.6043615513.

The spelling of 68721672 in words is "sixty-eight million, seven hundred twenty-one thousand, six hundred seventy-two".