78523438 has 16 divisors (see below), whose sum is σ = 135001440. Its totient is φ = 33555456.

The previous prime is 78523433. The next prime is 78523441. The reversal of 78523438 is 83432587.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78523438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78523433) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3003 + ... + 12886.

It is an arithmetic number, because the mean of its divisors is an integer number (8437590).

Almost surely, 2^78523438 is an apocalyptic number.

78523438 is a deficient number, since it is larger than the sum of its proper divisors (56478002).

78523438 is a wasteful number, since it uses less digits than its factorization.

78523438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16251.

The product of its digits is 161280, while the sum is 40.

The square root of 78523438 is about 8861.3451574803. The cubic root of 78523438 is about 428.2194953864.

It can be divided in two parts, 78523 and 438, that added together give a square (78961 = 281²).

The spelling of 78523438 in words is "seventy-eight million, five hundred twenty-three thousand, four hundred thirty-eight".