78505538 has 8 divisors (see below), whose sum is σ = 117844032. Its totient is φ = 39224196.

The previous prime is 78505519. The next prime is 78505543. The reversal of 78505538 is 83550587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78505495 and 78505504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10670 + ... + 16457.

It is an arithmetic number, because the mean of its divisors is an integer number (14730504).

Almost surely, 2^78505538 is an apocalyptic number.

78505538 is a deficient number, since it is larger than the sum of its proper divisors (39338494).

78505538 is a wasteful number, since it uses less digits than its factorization.

78505538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28576.

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 78505538 is about 8860.3350952433. The cubic root of 78505538 is about 428.1869543104.

The spelling of 78505538 in words is "seventy-eight million, five hundred five thousand, five hundred thirty-eight".