78009946 has 8 divisors (see below), whose sum is σ = 133731360. Its totient is φ = 33432828.

The previous prime is 78009941. The next prime is 78009983. The reversal of 78009946 is 64990087.

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

It is not an unprimeable number, because it can be changed into a prime (78009941) 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 3 ways as a sum of consecutive naturals, for example, 2786056 + ... + 2786083.

It is an arithmetic number, because the mean of its divisors is an integer number (16716420).

Almost surely, 2^78009946 is an apocalyptic number.

78009946 is a deficient number, since it is larger than the sum of its proper divisors (55721414).

78009946 is a wasteful number, since it uses less digits than its factorization.

78009946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5572148.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 78009946 is about 8832.3239297480. The cubic root of 78009946 is about 427.2840280233.

The spelling of 78009946 in words is "seventy-eight million, nine thousand, nine hundred forty-six".