68078661 has 16 divisors (see below), whose sum is σ = 103914624. Its totient is φ = 38836224.

The previous prime is 68078651. The next prime is 68078663. The reversal of 68078661 is 16687086.

It is not a de Polignac number, because 68078661 - 2⁵ = 68078629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68078663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11725 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (6494664).

Almost surely, 2^68078661 is an apocalyptic number.

It is an amenable number.

68078661 is a deficient number, since it is larger than the sum of its proper divisors (35835963).

68078661 is a wasteful number, since it uses less digits than its factorization.

68078661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 68078661 is about 8250.9793964111. The cubic root of 68078661 is about 408.3228353634.

The spelling of 68078661 in words is "sixty-eight million, seventy-eight thousand, six hundred sixty-one".