68815739 has 4 divisors (see below), whose sum is σ = 72437640. Its totient is φ = 65193840.

The previous prime is 68815729. The next prime is 68815759. The reversal of 68815739 is 93751886.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68815739 - 2⁴ = 68815723 is a prime.

It is a super-2 number, since 2×68815739² = 9471211868232242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68815693 and 68815702.

It is not an unprimeable number, because it can be changed into a prime (68815709) by changing a digit.

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, 1810922 + ... + 1810959.

It is an arithmetic number, because the mean of its divisors is an integer number (18109410).

Almost surely, 2^68815739 is an apocalyptic number.

68815739 is a deficient number, since it is larger than the sum of its proper divisors (3621901).

68815739 is a wasteful number, since it uses less digits than its factorization.

68815739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621900.

The product of its digits is 362880, while the sum is 47.

The square root of 68815739 is about 8295.5252395493. The cubic root of 68815739 is about 409.7911667007.

The spelling of 68815739 in words is "sixty-eight million, eight hundred fifteen thousand, seven hundred thirty-nine".