68308937 has 4 divisors (see below), whose sum is σ = 68352900. Its totient is φ = 68264976.

The previous prime is 68308931. The next prime is 68308943. The reversal of 68308937 is 73980386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73980386 = 2 ⋅36990193.

It is an interprime number because it is at equal distance from previous prime (68308931) and next prime (68308943).

It can be written as a sum of positive squares in 2 ways, for example, as 57093136 + 11215801 = 7556^2 + 3349^2 .

It is a cyclic number.

It is not a de Polignac number, because 68308937 - 2¹⁸ = 68046793 is a prime.

It is a super-2 number, since 2×68308937² = 9332221748139938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68308931) 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, 19562 + ... + 22787.

It is an arithmetic number, because the mean of its divisors is an integer number (17088225).

Almost surely, 2^68308937 is an apocalyptic number.

It is an amenable number.

68308937 is a deficient number, since it is larger than the sum of its proper divisors (43963).

68308937 is a wasteful number, since it uses less digits than its factorization.

68308937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43962.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 68308937 is about 8264.9220806974. The cubic root of 68308937 is about 408.7827011093.

The spelling of 68308937 in words is "sixty-eight million, three hundred eight thousand, nine hundred thirty-seven".