68643472 has 10 divisors (see below), whose sum is σ = 132996758. Its totient is φ = 34321728.

The previous prime is 68643461. The next prime is 68643479. The reversal of 68643472 is 27434686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 62473216 + 6170256 = 7904^2 + 2484^2 .

It is not an unprimeable number, because it can be changed into a prime (68643479) 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, 2145093 + ... + 2145124.

Almost surely, 2^68643472 is an apocalyptic number.

It is an amenable number.

68643472 is a deficient number, since it is larger than the sum of its proper divisors (64353286).

68643472 is a wasteful number, since it uses less digits than its factorization.

68643472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290225 (or 4290219 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The square root of 68643472 is about 8285.1356054080. The cubic root of 68643472 is about 409.4489364505.

The spelling of 68643472 in words is "sixty-eight million, six hundred forty-three thousand, four hundred seventy-two".