78109445 has 8 divisors (see below), whose sum is σ = 94470144. Its totient is φ = 61995024.

The previous prime is 78109417. The next prime is 78109453. The reversal of 78109445 is 54490187.

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 78109445 - 2²⁰ = 77060869 is a prime.

It is a super-2 number, since 2×78109445² = 12202170796416050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78109399 and 78109408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60869 + ... + 62138.

It is an arithmetic number, because the mean of its divisors is an integer number (11808768).

Almost surely, 2^78109445 is an apocalyptic number.

It is an amenable number.

78109445 is a deficient number, since it is larger than the sum of its proper divisors (16360699).

78109445 is a wasteful number, since it uses less digits than its factorization.

78109445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123139.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 78109445 is about 8837.9547973499. The cubic root of 78109445 is about 427.4656128651.

The spelling of 78109445 in words is "seventy-eight million, one hundred nine thousand, four hundred forty-five".