78778141 has 8 divisors (see below), whose sum is σ = 85284864. Its totient is φ = 72335280.

The previous prime is 78778129. The next prime is 78778207. The reversal of 78778141 is 14187787.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78778141 - 2⁵ = 78778109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78778241) 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 7 ways as a sum of consecutive naturals, for example, 13381 + ... + 18346.

It is an arithmetic number, because the mean of its divisors is an integer number (10660608).

Almost surely, 2^78778141 is an apocalyptic number.

It is an amenable number.

78778141 is a deficient number, since it is larger than the sum of its proper divisors (6506723).

78778141 is a wasteful number, since it uses less digits than its factorization.

78778141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31931.

The product of its digits is 87808, while the sum is 43.

The square root of 78778141 is about 8875.7050987513. The cubic root of 78778141 is about 428.6819945576.

The spelling of 78778141 in words is "seventy-eight million, seven hundred seventy-eight thousand, one hundred forty-one".