78689955 has 8 divisors (see below), whose sum is σ = 125903952. Its totient is φ = 41967968.

The previous prime is 78689953. The next prime is 78689971. The reversal of 78689955 is 55998687.

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 78689955 - 2¹ = 78689953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78689895 and 78689904.

It is not an unprimeable number, because it can be changed into a prime (78689951) 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, 2622984 + ... + 2623013.

It is an arithmetic number, because the mean of its divisors is an integer number (15737994).

Almost surely, 2^78689955 is an apocalyptic number.

78689955 is a deficient number, since it is larger than the sum of its proper divisors (47213997).

78689955 is a wasteful number, since it uses less digits than its factorization.

78689955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246005.

The product of its digits is 5443200, while the sum is 57.

The square root of 78689955 is about 8870.7358770285. The cubic root of 78689955 is about 428.5219761193.

The spelling of 78689955 in words is "seventy-eight million, six hundred eighty-nine thousand, nine hundred fifty-five".