78539946 has 32 divisors (see below), whose sum is σ = 164946240. Its totient is φ = 24896256.

The previous prime is 78539921. The next prime is 78539947. The reversal of 78539946 is 64993587.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78539947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8290 + ... + 15026.

It is an arithmetic number, because the mean of its divisors is an integer number (5154570).

Almost surely, 2^78539946 is an apocalyptic number.

78539946 is an abundant number, since it is smaller than the sum of its proper divisors (86406294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78539946 is a wasteful number, since it uses less digits than its factorization.

78539946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838.

The product of its digits is 1632960, while the sum is 51.

The square root of 78539946 is about 8862.2765698211. The cubic root of 78539946 is about 428.2495015106.

The spelling of 78539946 in words is "seventy-eight million, five hundred thirty-nine thousand, nine hundred forty-six".