68637973 has 2 divisors, whose sum is σ = 68637974. Its totient is φ = 68637972.

The previous prime is 68637953. The next prime is 68637979. The reversal of 68637973 is 37973686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57866449 + 10771524 = 7607^2 + 3282^2 .

It is a cyclic number.

It is not a de Polignac number, because 68637973 - 2²¹ = 66540821 is a prime.

It is a super-2 number, since 2×68637973² = 9422342675097458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68637979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34318986 + 34318987.

It is an arithmetic number, because the mean of its divisors is an integer number (34318987).

Almost surely, 2^68637973 is an apocalyptic number.

It is an amenable number.

68637973 is a deficient number, since it is larger than the sum of its proper divisors (1).

68637973 is an equidigital number, since it uses as much as digits as its factorization.

68637973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 49.

The square root of 68637973 is about 8284.8037393773. The cubic root of 68637973 is about 409.4380025638.

The spelling of 68637973 in words is "sixty-eight million, six hundred thirty-seven thousand, nine hundred seventy-three".