68542138 has 32 divisors (see below), whose sum is σ = 123148800. Its totient is φ = 27990144.

The previous prime is 68542073. The next prime is 68542153. The reversal of 68542138 is 83124586.

It is a happy number.

It is a super-2 number, since 2×68542138² = 9396049363222088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68542097 and 68542106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31006 + ... + 33142.

It is an arithmetic number, because the mean of its divisors is an integer number (3848400).

Almost surely, 2^68542138 is an apocalyptic number.

68542138 is a deficient number, since it is larger than the sum of its proper divisors (54606662).

68542138 is a wasteful number, since it uses less digits than its factorization.

68542138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254.

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

The square root of 68542138 is about 8279.0179369295. The cubic root of 68542138 is about 409.2473560672.

The spelling of 68542138 in words is "sixty-eight million, five hundred forty-two thousand, one hundred thirty-eight".