78110661 has 8 divisors (see below), whose sum is σ = 106569760. Its totient is φ = 50862672.

The previous prime is 78110651. The next prime is 78110671. The reversal of 78110661 is 16601187.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78110651) and next prime (78110671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78110661 - 2⁵ = 78110629 is a prime.

It is a super-2 number, since 2×78110661² = 12202550723713842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78110621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302626 + ... + 302883.

It is an arithmetic number, because the mean of its divisors is an integer number (13321220).

Almost surely, 2^78110661 is an apocalyptic number.

It is an amenable number.

78110661 is a deficient number, since it is larger than the sum of its proper divisors (28459099).

78110661 is a wasteful number, since it uses less digits than its factorization.

78110661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605555.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 78110661 is about 8838.0235912788. The cubic root of 78110661 is about 427.4678311008.

The spelling of 78110661 in words is "seventy-eight million, one hundred ten thousand, six hundred sixty-one".