78987012 has 24 divisors (see below), whose sum is σ = 198480576. Its totient is φ = 24303648.

The previous prime is 78986993. The next prime is 78987019. The reversal of 78987012 is 21078987.

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

It is not an unprimeable number, because it can be changed into a prime (78987019) 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, 253008 + ... + 253319.

It is an arithmetic number, because the mean of its divisors is an integer number (8270024).

Almost surely, 2^78987012 is an apocalyptic number.

It is an amenable number.

78987012 is an abundant number, since it is smaller than the sum of its proper divisors (119493564).

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

78987012 is a wasteful number, since it uses less digits than its factorization.

78987012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506347 (or 506345 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 78987012 is about 8887.4637552004. The cubic root of 78987012 is about 429.0605268841.

The spelling of 78987012 in words is "seventy-eight million, nine hundred eighty-seven thousand, twelve".