78464173 has 8 divisors (see below), whose sum is σ = 80067960. Its totient is φ = 76876800.

The previous prime is 78464171. The next prime is 78464179. The reversal of 78464173 is 37146487.

It can be written as a sum of positive squares in 4 ways, for example, as 35259844 + 43204329 = 5938^2 + 6573^2 .

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 78464173 - 2¹ = 78464171 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 (78464171) 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, 5793 + ... + 13801.

It is an arithmetic number, because the mean of its divisors is an integer number (10008495).

Almost surely, 2^78464173 is an apocalyptic number.

It is an amenable number.

78464173 is a deficient number, since it is larger than the sum of its proper divisors (1603787).

78464173 is a wasteful number, since it uses less digits than its factorization.

78464173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8207.

The product of its digits is 112896, while the sum is 40.

The square root of 78464173 is about 8858.0005080153. Note that the first 3 decimals coincide. The cubic root of 78464173 is about 428.1117364104. Note that the first 3 decimals are identical.

The spelling of 78464173 in words is "seventy-eight million, four hundred sixty-four thousand, one hundred seventy-three".