78691097 has 8 divisors (see below), whose sum is σ = 79487520. Its totient is φ = 77898240.

The previous prime is 78691091. The next prime is 78691099. The reversal of 78691097 is 79019687.

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 78691097 - 2⁶ = 78691033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78691091) 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, 67673 + ... + 68825.

It is an arithmetic number, because the mean of its divisors is an integer number (9935940).

Almost surely, 2^78691097 is an apocalyptic number.

It is an amenable number.

78691097 is a deficient number, since it is larger than the sum of its proper divisors (796423).

78691097 is a wasteful number, since it uses less digits than its factorization.

78691097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 78691097 is about 8870.8002457501. The cubic root of 78691097 is about 428.5240491062.

The spelling of 78691097 in words is "seventy-eight million, six hundred ninety-one thousand, ninety-seven".