78523398 has 32 divisors (see below), whose sum is σ = 179217120. Its totient is φ = 25466400.

The previous prime is 78523351. The next prime is 78523433. The reversal of 78523398 is 89332587.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17653 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (5600535).

Almost surely, 2^78523398 is an apocalyptic number.

78523398 is an abundant number, since it is smaller than the sum of its proper divisors (100693722).

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

78523398 is a wasteful number, since it uses less digits than its factorization.

78523398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39349 (or 39343 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 78523398 is about 8861.3429004864. The cubic root of 78523398 is about 428.2194226744.

The spelling of 78523398 in words is "seventy-eight million, five hundred twenty-three thousand, three hundred ninety-eight".