68621845 has 4 divisors (see below), whose sum is σ = 82346220. Its totient is φ = 54897472.

The previous prime is 68621831. The next prime is 68621887. The reversal of 68621845 is 54812686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29571844 + 39050001 = 5438^2 + 6249^2 .

It is a cyclic number.

It is not a de Polignac number, because 68621845 - 2¹¹ = 68619797 is a prime.

It is a super-2 number, since 2×68621845² = 9417915222408050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 68621798 and 68621807.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 6862180 + ... + 6862189.

It is an arithmetic number, because the mean of its divisors is an integer number (20586555).

Almost surely, 2^68621845 is an apocalyptic number.

It is an amenable number.

68621845 is a deficient number, since it is larger than the sum of its proper divisors (13724375).

68621845 is a wasteful number, since it uses less digits than its factorization.

68621845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13724374.

The product of its digits is 92160, while the sum is 40.

The square root of 68621845 is about 8283.8303338492. The cubic root of 68621845 is about 409.4059312332.

The spelling of 68621845 in words is "sixty-eight million, six hundred twenty-one thousand, eight hundred forty-five".