78755646 has 16 divisors (see below), whose sum is σ = 165801600. Its totient is φ = 24870168.

The previous prime is 78755639. The next prime is 78755671. The reversal of 78755646 is 64655787.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78755595 and 78755604.

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, 345306 + ... + 345533.

It is an arithmetic number, because the mean of its divisors is an integer number (10362600).

Almost surely, 2^78755646 is an apocalyptic number.

78755646 is an abundant number, since it is smaller than the sum of its proper divisors (87045954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78755646 is a wasteful number, since it uses less digits than its factorization.

78755646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690863.

The product of its digits is 1411200, while the sum is 48.

The square root of 78755646 is about 8874.4377850093. The cubic root of 78755646 is about 428.6411874701.

It can be divided in two parts, 78755 and 646, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 78755646 in words is "seventy-eight million, seven hundred fifty-five thousand, six hundred forty-six".