68940657 has 12 divisors (see below), whose sum is σ = 102272820. Its totient is φ = 44718048.

The previous prime is 68940649. The next prime is 68940659. The reversal of 68940657 is 75604986.

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 1962801 = 8184^2 + 1401^2 .

It is not a de Polignac number, because 68940657 - 2³ = 68940649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68940659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103182 + ... + 103847.

It is an arithmetic number, because the mean of its divisors is an integer number (8522735).

Almost surely, 2^68940657 is an apocalyptic number.

It is an amenable number.

68940657 is a deficient number, since it is larger than the sum of its proper divisors (33332163).

68940657 is a wasteful number, since it uses less digits than its factorization.

68940657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207072 (or 207069 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 68940657 is about 8303.0510657228. The cubic root of 68940657 is about 410.0389750773.

The spelling of 68940657 in words is "sixty-eight million, nine hundred forty thousand, six hundred fifty-seven".