68821949 has 4 divisors (see below), whose sum is σ = 78653664. Its totient is φ = 58990236.

The previous prime is 68821943. The next prime is 68821979. The reversal of 68821949 is 94912886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68821949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68821943) 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, 4915847 + ... + 4915860.

It is an arithmetic number, because the mean of its divisors is an integer number (19663416).

Almost surely, 2^68821949 is an apocalyptic number.

It is an amenable number.

68821949 is a deficient number, since it is larger than the sum of its proper divisors (9831715).

68821949 is an equidigital number, since it uses as much as digits as its factorization.

68821949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9831714.

The product of its digits is 248832, while the sum is 47.

The square root of 68821949 is about 8295.8995292855. The cubic root of 68821949 is about 409.8034929826.

The spelling of 68821949 in words is "sixty-eight million, eight hundred twenty-one thousand, nine hundred forty-nine".