68273721 has 6 divisors (see below), whose sum is σ = 98617610. Its totient is φ = 45515808.

The previous prime is 68273713. The next prime is 68273767. The reversal of 68273721 is 12737286.

It can be written as a sum of positive squares in only one way, i.e., 39501225 + 28772496 = 6285^2 + 5364^2 .

It is not a de Polignac number, because 68273721 - 2³ = 68273713 is a prime.

It is a super-2 number, since 2×68273721² = 9322601958371682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68273771) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3792976 + ... + 3792993.

Almost surely, 2^68273721 is an apocalyptic number.

It is an amenable number.

68273721 is a deficient number, since it is larger than the sum of its proper divisors (30343889).

68273721 is a wasteful number, since it uses less digits than its factorization.

68273721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585975 (or 7585972 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 68273721 is about 8262.7913564364. The cubic root of 68273721 is about 408.7124410682.

The spelling of 68273721 in words is "sixty-eight million, two hundred seventy-three thousand, seven hundred twenty-one".