68705690 has 16 divisors (see below), whose sum is σ = 123829992. Its totient is φ = 27446784.

The previous prime is 68705647. The next prime is 68705713. The reversal of 68705690 is 9650786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 66765241 + 1940449 = 8171^2 + 1393^2 .

It is a super-2 number, since 2×68705690² = 9440943676752200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4562 + ... + 12578.

Almost surely, 2^68705690 is an apocalyptic number.

68705690 is a deficient number, since it is larger than the sum of its proper divisors (55124302).

68705690 is a wasteful number, since it uses less digits than its factorization.

68705690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 68705690 is about 8288.8895516830. The cubic root of 68705690 is about 409.5726063846.

The spelling of 68705690 in words is "sixty-eight million, seven hundred five thousand, six hundred ninety".