78531366 has 16 divisors (see below), whose sum is σ = 158531904. Its totient is φ = 25932264.

The previous prime is 78531289. The next prime is 78531367. The reversal of 78531366 is 66313587.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531367) 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, 60520 + ... + 61803.

It is an arithmetic number, because the mean of its divisors is an integer number (9908244).

Almost surely, 2^78531366 is an apocalyptic number.

78531366 is an abundant number, since it is smaller than the sum of its proper divisors (80000538).

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

78531366 is a wasteful number, since it uses less digits than its factorization.

78531366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122435.

The product of its digits is 90720, while the sum is 39.

The square root of 78531366 is about 8861.7924823367. The cubic root of 78531366 is about 428.2339064124.

The spelling of 78531366 in words is "seventy-eight million, five hundred thirty-one thousand, three hundred sixty-six".