68491747 has 4 divisors (see below), whose sum is σ = 68609016. Its totient is φ = 68374480.

The previous prime is 68491711. The next prime is 68491757. The reversal of 68491747 is 74719486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68491747 - 2¹⁵ = 68458979 is a prime.

It is a super-2 number, since 2×68491747² = 9382238814224018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68491697 and 68491706.

It is not an unprimeable number, because it can be changed into a prime (68491757) 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, 57754 + ... + 58927.

It is an arithmetic number, because the mean of its divisors is an integer number (17152254).

Almost surely, 2^68491747 is an apocalyptic number.

68491747 is a deficient number, since it is larger than the sum of its proper divisors (117269).

68491747 is a wasteful number, since it uses less digits than its factorization.

68491747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117268.

The product of its digits is 338688, while the sum is 46.

The square root of 68491747 is about 8275.9740816414. The cubic root of 68491747 is about 409.1470409427.

The spelling of 68491747 in words is "sixty-eight million, four hundred ninety-one thousand, seven hundred forty-seven".