68028649 has 4 divisors (see below), whose sum is σ = 73261636. Its totient is φ = 62795664.

The previous prime is 68028647. The next prime is 68028659. The reversal of 68028649 is 94682086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94682086 = 2 ⋅47341043.

It can be written as a sum of positive squares in 2 ways, for example, as 23232400 + 44796249 = 4820^2 + 6693^2 .

It is a cyclic number.

It is not a de Polignac number, because 68028649 - 2¹ = 68028647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68028643) 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, 2616474 + ... + 2616499.

It is an arithmetic number, because the mean of its divisors is an integer number (18315409).

Almost surely, 2^68028649 is an apocalyptic number.

It is an amenable number.

68028649 is a deficient number, since it is larger than the sum of its proper divisors (5232987).

68028649 is a wasteful number, since it uses less digits than its factorization.

68028649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232986.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 68028649 is about 8247.9481690903. The cubic root of 68028649 is about 408.2228233873. Note that the first 3 decimals are identical.

It can be divided in two parts, 6802 and 8649, that added together give a palindrome (15451).

The spelling of 68028649 in words is "sixty-eight million, twenty-eight thousand, six hundred forty-nine".