68547840 has 72 divisors (see below), whose sum is σ = 218936928. Its totient is φ = 18278400.

The previous prime is 68547823. The next prime is 68547841. The reversal of 68547840 is 4874586.

It is a junction number, because it is equal to n+sod(n) for n = 68547792 and 68547801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68547841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5086 + ... + 12765.

Almost surely, 2^68547840 is an apocalyptic number.

68547840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68547840 is an abundant number, since it is smaller than the sum of its proper divisors (150389088).

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

68547840 is a wasteful number, since it uses less digits than its factorization.

68547840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17875 (or 17861 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 68547840 is about 8279.3622942833. The cubic root of 68547840 is about 409.2587041410.

The spelling of 68547840 in words is "sixty-eight million, five hundred forty-seven thousand, eight hundred forty".