68672761 has 4 divisors (see below), whose sum is σ = 68711524. Its totient is φ = 68634000.

The previous prime is 68672743. The next prime is 68672767. The reversal of 68672761 is 16727686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 511225 + 68161536 = 715^2 + 8256^2 .

It is a cyclic number.

It is not a de Polignac number, because 68672761 - 2⁵ = 68672729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68672767) 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, 16590 + ... + 20311.

It is an arithmetic number, because the mean of its divisors is an integer number (17177881).

Almost surely, 2^68672761 is an apocalyptic number.

It is an amenable number.

68672761 is a deficient number, since it is larger than the sum of its proper divisors (38763).

68672761 is a wasteful number, since it uses less digits than its factorization.

68672761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38762.

The product of its digits is 169344, while the sum is 43.

The square root of 68672761 is about 8286.9029800040. The cubic root of 68672761 is about 409.5071631316.

The spelling of 68672761 in words is "sixty-eight million, six hundred seventy-two thousand, seven hundred sixty-one".