68264639 has 4 divisors (see below), whose sum is σ = 72280224. Its totient is φ = 64249056.

The previous prime is 68264617. The next prime is 68264681. The reversal of 68264639 is 93646286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93646286 = 2 ⋅46823143.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68264639 is a prime.

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 68264639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68264839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007767 + ... + 2007800.

It is an arithmetic number, because the mean of its divisors is an integer number (18070056).

Almost surely, 2^68264639 is an apocalyptic number.

68264639 is a deficient number, since it is larger than the sum of its proper divisors (4015585).

68264639 is a wasteful number, since it uses less digits than its factorization.

68264639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015584.

The product of its digits is 373248, while the sum is 44.

The square root of 68264639 is about 8262.2417660100. The cubic root of 68264639 is about 408.6943174967.

The spelling of 68264639 in words is "sixty-eight million, two hundred sixty-four thousand, six hundred thirty-nine".