78532578 has 20 divisors (see below), whose sum is σ = 175971510. Its totient is φ = 26177472.

The previous prime is 78532561. The next prime is 78532583. The reversal of 78532578 is 87523587.

78532578 is a `hidden beast` number, since 78 + 5 + 3 + 2 + 578 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 263169 = 8847^2 + 513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 242223 + ... + 242546.

Almost surely, 2^78532578 is an apocalyptic number.

78532578 is an abundant number, since it is smaller than the sum of its proper divisors (97438932).

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

78532578 is a wasteful number, since it uses less digits than its factorization.

78532578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484783 (or 484774 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 78532578 is about 8861.8608655293. The cubic root of 78532578 is about 428.2361094252.

The spelling of 78532578 in words is "seventy-eight million, five hundred thirty-two thousand, five hundred seventy-eight".