68771640 has 256 divisors, whose sum is σ = 258048000. Its totient is φ = 14307840.

The previous prime is 68771629. The next prime is 68771683. The reversal of 68771640 is 4617786.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 494691 + ... + 494829.

It is an arithmetic number, because the mean of its divisors is an integer number (1008000).

Almost surely, 2^68771640 is an apocalyptic number.

68771640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68771640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129024000).

68771640 is an abundant number, since it is smaller than the sum of its proper divisors (189276360).

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

68771640 is a wasteful number, since it uses less digits than its factorization.

68771640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 68771640 is about 8292.8668143170. The cubic root of 68771640 is about 409.7036128818.

It can be divided in two parts, 687 and 71640, that added together give a palindrome (72327).

The spelling of 68771640 in words is "sixty-eight million, seven hundred seventy-one thousand, six hundred forty".