68661739 has 4 divisors (see below), whose sum is σ = 71647056. Its totient is φ = 65676424.

The previous prime is 68661737. The next prime is 68661787. The reversal of 68661739 is 93716686.

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 68661739 - 2¹ = 68661737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68661731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492624 + ... + 1492669.

It is an arithmetic number, because the mean of its divisors is an integer number (17911764).

Almost surely, 2^68661739 is an apocalyptic number.

68661739 is a deficient number, since it is larger than the sum of its proper divisors (2985317).

68661739 is a wasteful number, since it uses less digits than its factorization.

68661739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985316.

The product of its digits is 326592, while the sum is 46.

The square root of 68661739 is about 8286.2379280347. The cubic root of 68661739 is about 409.4852532827.

The spelling of 68661739 in words is "sixty-eight million, six hundred sixty-one thousand, seven hundred thirty-nine".