78578390 has 16 divisors (see below), whose sum is σ = 154299600. Its totient is φ = 28573920.

The previous prime is 78578359. The next prime is 78578393. The reversal of 78578390 is 9387587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78578393) 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, 357065 + ... + 357284.

It is an arithmetic number, because the mean of its divisors is an integer number (9643725).

Almost surely, 2^78578390 is an apocalyptic number.

78578390 is a deficient number, since it is larger than the sum of its proper divisors (75721210).

78578390 is a wasteful number, since it uses less digits than its factorization.

78578390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714367.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 78578390 is about 8864.4452731121. The cubic root of 78578390 is about 428.3193637875.

The spelling of 78578390 in words is "seventy-eight million, five hundred seventy-eight thousand, three hundred ninety".