78641465 has 16 divisors (see below), whose sum is σ = 110767872. Its totient is φ = 52467264.

The previous prime is 78641449. The next prime is 78641477. The reversal of 78641465 is 56414687.

It is a cyclic number.

It is not a de Polignac number, because 78641465 - 2⁴ = 78641449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 29069 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (6922992).

Almost surely, 2^78641465 is an apocalyptic number.

It is an amenable number.

78641465 is a deficient number, since it is larger than the sum of its proper divisors (32126407).

78641465 is a wasteful number, since it uses less digits than its factorization.

78641465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60776.

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

The square root of 78641465 is about 8868.0023116822. The cubic root of 78641465 is about 428.4339373508.

Subtracting from 78641465 its sum of digits (41), we obtain a square (78641424 = 8868²).

The spelling of 78641465 in words is "seventy-eight million, six hundred forty-one thousand, four hundred sixty-five".