78384012 has 48 divisors (see below), whose sum is σ = 213894912. Its totient is φ = 21873600.

The previous prime is 78384011. The next prime is 78384017. The reversal of 78384012 is 21048387.

It is a super-2 number, since 2×78384012² = 12288106674432288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78384011) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7239 + ... + 14462.

It is an arithmetic number, because the mean of its divisors is an integer number (4456144).

Almost surely, 2^78384012 is an apocalyptic number.

It is an amenable number.

78384012 is an abundant number, since it is smaller than the sum of its proper divisors (135510900).

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

78384012 is a wasteful number, since it uses less digits than its factorization.

78384012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21758 (or 21756 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 78384012 is about 8853.4745721666. The cubic root of 78384012 is about 427.9658967790.

The spelling of 78384012 in words is "seventy-eight million, three hundred eighty-four thousand, twelve".