68539420 has 24 divisors (see below), whose sum is σ = 147281904. Its totient is φ = 26777856.

The previous prime is 68539411. The next prime is 68539433. The reversal of 68539420 is 2493586.

It is a self number, because there is not a number n which added to its sum of digits gives 68539420.

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, 38989 + ... + 40708.

It is an arithmetic number, because the mean of its divisors is an integer number (6136746).

Almost surely, 2^68539420 is an apocalyptic number.

It is an amenable number.

68539420 is an abundant number, since it is smaller than the sum of its proper divisors (78742484).

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

68539420 is a wasteful number, since it uses less digits than its factorization.

68539420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79749 (or 79747 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 68539420 is about 8278.8537853981. The cubic root of 68539420 is about 409.2419465043.

The spelling of 68539420 in words is "sixty-eight million, five hundred thirty-nine thousand, four hundred twenty".