68028907 has 4 divisors (see below), whose sum is σ = 68060656. Its totient is φ = 67997160.

The previous prime is 68028899. The next prime is 68028937. The reversal of 68028907 is 70982086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68028907 - 2³ = 68028899 is a prime.

It is a super-2 number, since 2×68028907² = 9255864375229298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68028907.

It is not an unprimeable number, because it can be changed into a prime (68028937) 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, 12408 + ... + 17029.

It is an arithmetic number, because the mean of its divisors is an integer number (17015164).

Almost surely, 2^68028907 is an apocalyptic number.

68028907 is a deficient number, since it is larger than the sum of its proper divisors (31749).

68028907 is a wasteful number, since it uses less digits than its factorization.

68028907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31748.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 68028907 is about 8247.9638093289. The cubic root of 68028907 is about 408.2233394510.

The spelling of 68028907 in words is "sixty-eight million, twenty-eight thousand, nine hundred seven".