68855640 has 64 divisors (see below), whose sum is σ = 236079360. Its totient is φ = 15738240.

The previous prime is 68855623. The next prime is 68855659. The reversal of 68855640 is 4655886.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 68855592 and 68855601.

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, 40146 + ... + 41825.

It is an arithmetic number, because the mean of its divisors is an integer number (3688740).

Almost surely, 2^68855640 is an apocalyptic number.

68855640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68855640 is an abundant number, since it is smaller than the sum of its proper divisors (167223720).

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

68855640 is a wasteful number, since it uses less digits than its factorization.

68855640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81992 (or 81988 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 68855640 is about 8297.9298623211. The cubic root of 68855640 is about 409.8703536151.

The spelling of 68855640 in words is "sixty-eight million, eight hundred fifty-five thousand, six hundred forty".