68843640 has 64 divisors (see below), whose sum is σ = 207100800. Its totient is φ = 18307712.

The previous prime is 68843629. The next prime is 68843657. The reversal of 68843640 is 4634886.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67051 + ... + 68069.

It is an arithmetic number, because the mean of its divisors is an integer number (3235950).

Almost surely, 2^68843640 is an apocalyptic number.

68843640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68843640 is an abundant number, since it is smaller than the sum of its proper divisors (138257160).

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

68843640 is a wasteful number, since it uses less digits than its factorization.

68843640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 68843640 is about 8297.2067589039. The cubic root of 68843640 is about 409.8465418161.

The spelling of 68843640 in words is "sixty-eight million, eight hundred forty-three thousand, six hundred forty".