78091012 has 12 divisors (see below), whose sum is σ = 137180736. Its totient is φ = 38896520.

The previous prime is 78090949. The next prime is 78091021. The reversal of 78091012 is 21019087.

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 3 ways as a sum of consecutive naturals, for example, 36064 + ... + 38167.

It is an arithmetic number, because the mean of its divisors is an integer number (11431728).

Almost surely, 2^78091012 is an apocalyptic number.

It is an amenable number.

78091012 is a deficient number, since it is larger than the sum of its proper divisors (59089724).

78091012 is a wasteful number, since it uses less digits than its factorization.

78091012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74498 (or 74496 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 78091012 is about 8836.9119040534. The cubic root of 78091012 is about 427.4319844370.

The spelling of 78091012 in words is "seventy-eight million, ninety-one thousand, twelve".