68640486 has 16 divisors (see below), whose sum is σ = 137586864. Its totient is φ = 22829184.

The previous prime is 68640469. The next prime is 68640491. The reversal of 68640486 is 68404686.

It is a super-3 number, since 3×68640486³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent 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, 9775 + ... + 15258.

It is an arithmetic number, because the mean of its divisors is an integer number (8599179).

Almost surely, 2^68640486 is an apocalyptic number.

68640486 is an abundant number, since it is smaller than the sum of its proper divisors (68946378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68640486 is a wasteful number, since it uses less digits than its factorization.

68640486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25495.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 68640486 is about 8284.9554012077. The cubic root of 68640486 is about 409.4429993370.

The spelling of 68640486 in words is "sixty-eight million, six hundred forty thousand, four hundred eighty-six".