78109597 has 4 divisors (see below), whose sum is σ = 78234016. Its totient is φ = 77985180.

The previous prime is 78109583. The next prime is 78109601. The reversal of 78109597 is 79590187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79590187 = 311 ⋅255917.

It is a cyclic number.

It is not a de Polignac number, because 78109597 - 2¹⁵ = 78076829 is a prime.

It is a super-2 number, since 2×78109597² = 12202218287004818, 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 (78109397) 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 3 ways as a sum of consecutive naturals, for example, 61263 + ... + 62524.

It is an arithmetic number, because the mean of its divisors is an integer number (19558504).

Almost surely, 2^78109597 is an apocalyptic number.

It is an amenable number.

78109597 is a deficient number, since it is larger than the sum of its proper divisors (124419).

78109597 is a wasteful number, since it uses less digits than its factorization.

78109597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124418.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 78109597 is about 8837.9633966203. The cubic root of 78109597 is about 427.4658901458.

The spelling of 78109597 in words is "seventy-eight million, one hundred nine thousand, five hundred ninety-seven".