78309412 has 24 divisors (see below), whose sum is σ = 152742240. Its totient is φ = 34911360.

The previous prime is 78309391. The next prime is 78309433. The reversal of 78309412 is 21490387.

It is an interprime number because it is at equal distance from previous prime (78309391) and next prime (78309433).

It is a super-2 number, since 2×78309412² = 12264728015571488, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29014 + ... + 31597.

It is an arithmetic number, because the mean of its divisors is an integer number (6364260).

Almost surely, 2^78309412 is an apocalyptic number.

It is an amenable number.

78309412 is a deficient number, since it is larger than the sum of its proper divisors (74432828).

78309412 is a wasteful number, since it uses less digits than its factorization.

78309412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60651 (or 60649 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 78309412 is about 8849.2605340785. The cubic root of 78309412 is about 427.8300851138.

Adding to 78309412 its reverse (21490387), we get a palindrome (99799799).

The spelling of 78309412 in words is "seventy-eight million, three hundred nine thousand, four hundred twelve".