68138524 has 12 divisors (see below), whose sum is σ = 119427448. Its totient is φ = 34016400.

The previous prime is 68138509. The next prime is 68138561. The reversal of 68138524 is 42583186.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10242 + ... + 15529.

Almost surely, 2^68138524 is an apocalyptic number.

It is an amenable number.

68138524 is a deficient number, since it is larger than the sum of its proper divisors (51288924).

68138524 is a wasteful number, since it uses less digits than its factorization.

68138524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26436 (or 26434 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 68138524 is about 8254.6062292516. The cubic root of 68138524 is about 408.4424825896.

The spelling of 68138524 in words is "sixty-eight million, one hundred thirty-eight thousand, five hundred twenty-four".