68140672 has 16 divisors (see below), whose sum is σ = 135749250. Its totient is φ = 34070272.

The previous prime is 68140661. The next prime is 68140673. The reversal of 68140672 is 27604186.

It can be written as a sum of positive squares in only one way, i.e., 41679936 + 26460736 = 6456^2 + 5144^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-3 number, since 3×68140672³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (68140673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266047 + ... + 266302.

Almost surely, 2^68140672 is an apocalyptic number.

It is an amenable number.

68140672 is a deficient number, since it is larger than the sum of its proper divisors (67608578).

68140672 is an equidigital number, since it uses as much as digits as its factorization.

68140672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532363 (or 532351 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 68140672 is about 8254.7363374005. The cubic root of 68140672 is about 408.4467744604.

The spelling of 68140672 in words is "sixty-eight million, one hundred forty thousand, six hundred seventy-two".