78578258 has 32 divisors (see below), whose sum is σ = 135862272. Its totient is φ = 33734800.

The previous prime is 78578257. The next prime is 78578293. The reversal of 78578258 is 85287587.

It is not an unprimeable number, because it can be changed into a prime (78578251) by changing a digit.

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, 41063 + ... + 42933.

It is an arithmetic number, because the mean of its divisors is an integer number (4245696).

Almost surely, 2^78578258 is an apocalyptic number.

78578258 is a deficient number, since it is larger than the sum of its proper divisors (57284014).

78578258 is a wasteful number, since it uses less digits than its factorization.

78578258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its digits is 1254400, while the sum is 50.

The square root of 78578258 is about 8864.4378276346. The cubic root of 78578258 is about 428.3191239497.

The spelling of 78578258 in words is "seventy-eight million, five hundred seventy-eight thousand, two hundred fifty-eight".