78909394 has 8 divisors (see below), whose sum is σ = 124593840. Its totient is φ = 37378116.

The previous prime is 78909371. The next prime is 78909431. The reversal of 78909394 is 49390987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78909394² = 12453384922894472, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1038244 + ... + 1038319.

It is an arithmetic number, because the mean of its divisors is an integer number (15574230).

Almost surely, 2^78909394 is an apocalyptic number.

78909394 is a deficient number, since it is larger than the sum of its proper divisors (45684446).

78909394 is a wasteful number, since it uses less digits than its factorization.

78909394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076584.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 78909394 is about 8883.0959693116. The cubic root of 78909394 is about 428.9199394904.

The spelling of 78909394 in words is "seventy-eight million, nine hundred nine thousand, three hundred ninety-four".