68506690 has 32 divisors (see below), whose sum is σ = 141732864. Its totient is φ = 23353920.

The previous prime is 68506681. The next prime is 68506699. The reversal of 68506690 is 9660586.

It is an interprime number because it is at equal distance from previous prime (68506681) and next prime (68506699).

It is a super-2 number, since 2×68506690² = 9386333149512200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (68506699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9967 + ... + 15373.

It is an arithmetic number, because the mean of its divisors is an integer number (4429152).

Almost surely, 2^68506690 is an apocalyptic number.

68506690 is an abundant number, since it is smaller than the sum of its proper divisors (73226174).

68506690 is a wasteful number, since it uses less digits than its factorization.

68506690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 68506690 is about 8276.8768264364. The cubic root of 68506690 is about 409.1767936255.

It can be divided in two parts, 68506 and 690, that added together give a palindrome (69196).

The spelling of 68506690 in words is "sixty-eight million, five hundred six thousand, six hundred ninety".