68929928 has 8 divisors (see below), whose sum is σ = 129243630. Its totient is φ = 34464960.

The previous prime is 68929921. The next prime is 68929963. The reversal of 68929928 is 82992986.

It can be written as a sum of positive squares in only one way, i.e., 68923204 + 6724 = 8302^2 + 82^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 68929928.

It is not an unprimeable number, because it can be changed into a prime (68929921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4308113 + ... + 4308128.

Almost surely, 2^68929928 is an apocalyptic number.

It is an amenable number.

68929928 is a deficient number, since it is larger than the sum of its proper divisors (60313702).

68929928 is a wasteful number, since it uses less digits than its factorization.

68929928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8616247 (or 8616243 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 53.

The square root of 68929928 is about 8302.4049527833. The cubic root of 68929928 is about 410.0177029834.

The spelling of 68929928 in words is "sixty-eight million, nine hundred twenty-nine thousand, nine hundred twenty-eight".