78205912 has 16 divisors (see below), whose sum is σ = 146754000. Its totient is φ = 39071520.

The previous prime is 78205889. The next prime is 78205913. The reversal of 78205912 is 21950287.

It is a super-2 number, since 2×78205912² = 12232329343503488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78205913) 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, 9237 + ... + 15547.

It is an arithmetic number, because the mean of its divisors is an integer number (9172125).

Almost surely, 2^78205912 is an apocalyptic number.

It is an amenable number.

78205912 is a deficient number, since it is larger than the sum of its proper divisors (68548088).

78205912 is a wasteful number, since it uses less digits than its factorization.

78205912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866 (or 7862 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 78205912 is about 8843.4106542668. The cubic root of 78205912 is about 427.6415171618.

The spelling of 78205912 in words is "seventy-eight million, two hundred five thousand, nine hundred twelve".