78018912 has 36 divisors (see below), whose sum is σ = 221867100. Its totient is φ = 26006208.

The previous prime is 78018911. The next prime is 78018917. The reversal of 78018912 is 21981087.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78018911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135162 + ... + 135737.

It is an arithmetic number, because the mean of its divisors is an integer number (6162975).

Almost surely, 2^78018912 is an apocalyptic number.

78018912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78018912 is an abundant number, since it is smaller than the sum of its proper divisors (143848188).

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

78018912 is a wasteful number, since it uses less digits than its factorization.

78018912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270915 (or 270904 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 78018912 is about 8832.8314825995. The cubic root of 78018912 is about 427.3003972259.

Adding to 78018912 its reverse (21981087), we get a palindrome (99999999).

The spelling of 78018912 in words is "seventy-eight million, eighteen thousand, nine hundred twelve".