68538840 has 32 divisors (see below), whose sum is σ = 205616880. Its totient is φ = 18276992.

The previous prime is 68538829. The next prime is 68538857. The reversal of 68538840 is 4883586.

It is a super-3 number, since 3×68538840³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68538792 and 68538801.

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, 285459 + ... + 285698.

Almost surely, 2^68538840 is an apocalyptic number.

68538840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68538840 is an abundant number, since it is smaller than the sum of its proper divisors (137078040).

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

68538840 is a wasteful number, since it uses less digits than its factorization.

68538840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571171 (or 571167 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 68538840 is about 8278.8187563203. The cubic root of 68538840 is about 409.2407921273.

It can be divided in two parts, 68538 and 840, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 68538840 in words is "sixty-eight million, five hundred thirty-eight thousand, eight hundred forty".