68911690 has 8 divisors (see below), whose sum is σ = 124041060. Its totient is φ = 27564672.

The previous prime is 68911681. The next prime is 68911697. The reversal of 68911690 is 9611986.

It can be written as a sum of positive squares in 2 ways, for example, as 68608089 + 303601 = 8283^2 + 551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×68911690² = 9497642037312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68911697) 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, 3445575 + ... + 3445594.

Almost surely, 2^68911690 is an apocalyptic number.

68911690 is a deficient number, since it is larger than the sum of its proper divisors (55129370).

68911690 is a wasteful number, since it uses less digits than its factorization.

68911690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891176.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 68911690 is about 8301.3065236745. The cubic root of 68911690 is about 409.9815379353.

The spelling of 68911690 in words is "sixty-eight million, nine hundred eleven thousand, six hundred ninety".