78497197 has 4 divisors (see below), whose sum is σ = 78539740. Its totient is φ = 78454656.

The previous prime is 78497161. The next prime is 78497219. The reversal of 78497197 is 79179487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34327881 + 44169316 = 5859^2 + 6646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78497197 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 (78497117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18372 + ... + 22237.

It is an arithmetic number, because the mean of its divisors is an integer number (19634935).

Almost surely, 2^78497197 is an apocalyptic number.

It is an amenable number.

78497197 is a deficient number, since it is larger than the sum of its proper divisors (42543).

78497197 is a wasteful number, since it uses less digits than its factorization.

78497197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42542.

The product of its digits is 889056, while the sum is 52.

The square root of 78497197 is about 8859.8643894814. The cubic root of 78497197 is about 428.1717892067.

The spelling of 78497197 in words is "seventy-eight million, four hundred ninety-seven thousand, one hundred ninety-seven".