68908457 has 2 divisors, whose sum is σ = 68908458. Its totient is φ = 68908456.

The previous prime is 68908453. The next prime is 68908471. The reversal of 68908457 is 75480986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47554816 + 21353641 = 6896^2 + 4621^2 .

It is a cyclic number.

It is not a de Polignac number, because 68908457 - 2² = 68908453 is a prime.

It is a super-2 number, since 2×68908457² = 9496750892241698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68908451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34454228 + 34454229.

It is an arithmetic number, because the mean of its divisors is an integer number (34454229).

Almost surely, 2^68908457 is an apocalyptic number.

It is an amenable number.

68908457 is a deficient number, since it is larger than the sum of its proper divisors (1).

68908457 is an equidigital number, since it uses as much as digits as its factorization.

68908457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 68908457 is about 8301.1117930070. Note that the first 3 decimals coincide. The cubic root of 68908457 is about 409.9751263911.

The spelling of 68908457 in words is "sixty-eight million, nine hundred eight thousand, four hundred fifty-seven".