68339540 has 24 divisors (see below), whose sum is σ = 145129320. Its totient is φ = 27027968.

The previous prime is 68339533. The next prime is 68339587. The reversal of 68339540 is 4593386.

It can be written as a sum of positive squares in 4 ways, for example, as 244036 + 68095504 = 494^2 + 8252^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68339494 and 68339503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17417 + ... + 20976.

It is an arithmetic number, because the mean of its divisors is an integer number (6047055).

Almost surely, 2^68339540 is an apocalyptic number.

It is an amenable number.

68339540 is an abundant number, since it is smaller than the sum of its proper divisors (76789780).

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

68339540 is a wasteful number, since it uses less digits than its factorization.

68339540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38491 (or 38489 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 68339540 is about 8266.7732520010. The cubic root of 68339540 is about 408.8437380679.

The spelling of 68339540 in words is "sixty-eight million, three hundred thirty-nine thousand, five hundred forty".