78464165 has 12 divisors (see below), whose sum is σ = 101958084. Its totient is φ = 57942144.

The previous prime is 78464107. The next prime is 78464171. The reversal of 78464165 is 56146487.

It is a Cunningham number, because it is equal to 8858²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1481089 + 76983076 = 1217^2 + 8774^2 .

It is not a de Polignac number, because 78464165 - 2¹² = 78460069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45584 + ... + 47273.

It is an arithmetic number, because the mean of its divisors is an integer number (8496507).

Almost surely, 2^78464165 is an apocalyptic number.

It is an amenable number.

78464165 is a deficient number, since it is larger than the sum of its proper divisors (23493919).

78464165 is a wasteful number, since it uses less digits than its factorization.

78464165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92888 (or 92875 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 78464165 is about 8858.0000564462. Note that the first 4 decimals coincide. The cubic root of 78464165 is about 428.1117218607. Note that the first 3 decimals are identical.

The spelling of 78464165 in words is "seventy-eight million, four hundred sixty-four thousand, one hundred sixty-five".