78885646 has 32 divisors (see below), whose sum is σ = 139594752. Its totient is φ = 32733600.

The previous prime is 78885637. The next prime is 78885647. The reversal of 78885646 is 64658887.

Its product of digits (2580480) is a multiple of the sum of its prime divisors (1344).

It is a junction number, because it is equal to n+sod(n) for n = 78885593 and 78885602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78885647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65865 + ... + 67051.

It is an arithmetic number, because the mean of its divisors is an integer number (4362336).

Almost surely, 2^78885646 is an apocalyptic number.

78885646 is a deficient number, since it is larger than the sum of its proper divisors (60709106).

78885646 is a wasteful number, since it uses less digits than its factorization.

78885646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its digits is 2580480, while the sum is 52.

The square root of 78885646 is about 8881.7591725964. The cubic root of 78885646 is about 428.8769069598.

The spelling of 78885646 in words is "seventy-eight million, eight hundred eighty-five thousand, six hundred forty-six".