78945609 has 8 divisors (see below), whose sum is σ = 105869952. Its totient is φ = 52325840.

The previous prime is 78945577. The next prime is 78945641. The reversal of 78945609 is 90654987.

It is an interprime number because it is at equal distance from previous prime (78945577) and next prime (78945641).

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

It is a cyclic number.

It is not a de Polignac number, because 78945609 - 2⁵ = 78945577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78945509) 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, 75537 + ... + 76574.

It is an arithmetic number, because the mean of its divisors is an integer number (13233744).

Almost surely, 2^78945609 is an apocalyptic number.

It is an amenable number.

78945609 is a deficient number, since it is larger than the sum of its proper divisors (26924343).

78945609 is a wasteful number, since it uses less digits than its factorization.

78945609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152287.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 78945609 is about 8885.1341576816. The cubic root of 78945609 is about 428.9855462119.

The spelling of 78945609 in words is "seventy-eight million, nine hundred forty-five thousand, six hundred nine".