78165073 has 4 divisors (see below), whose sum is σ = 89331520. Its totient is φ = 66998628.

The previous prime is 78165067. The next prime is 78165077. The reversal of 78165073 is 37056187.

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.

It is a cyclic number.

It is not a de Polignac number, because 78165073 - 2⁹ = 78164561 is a prime.

It is a super-2 number, since 2×78165073² = 12219557274190658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78165077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5583213 + ... + 5583226.

It is an arithmetic number, because the mean of its divisors is an integer number (22332880).

Almost surely, 2^78165073 is an apocalyptic number.

It is an amenable number.

78165073 is a deficient number, since it is larger than the sum of its proper divisors (11166447).

78165073 is a wasteful number, since it uses less digits than its factorization.

78165073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166446.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 78165073 is about 8841.1013454207. The cubic root of 78165073 is about 427.5670662994.

The spelling of 78165073 in words is "seventy-eight million, one hundred sixty-five thousand, seventy-three".