78505852 has 6 divisors (see below), whose sum is σ = 137385248. Its totient is φ = 39252924.

The previous prime is 78505837. The next prime is 78505859. The reversal of 78505852 is 25850587.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78505859) by changing a digit.

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 as a sum of consecutive naturals, namely, 9813228 + ... + 9813235.

Almost surely, 2^78505852 is an apocalyptic number.

It is an amenable number.

78505852 is a deficient number, since it is larger than the sum of its proper divisors (58879396).

78505852 is a wasteful number, since it uses less digits than its factorization.

78505852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626467 (or 19626465 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 40.

The square root of 78505852 is about 8860.3528146457. The cubic root of 78505852 is about 428.1875251853.

It can be divided in two parts, 7850585 and 2, that added together give a palindrome (7850587).

The spelling of 78505852 in words is "seventy-eight million, five hundred five thousand, eight hundred fifty-two".