78489144 has 24 divisors (see below), whose sum is σ = 212574960. Its totient is φ = 26163024.

The previous prime is 78489143. The next prime is 78489161. The reversal of 78489144 is 44198487.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 78489144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78489143) 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 5 ways as a sum of consecutive naturals, for example, 544992 + ... + 545135.

It is an arithmetic number, because the mean of its divisors is an integer number (8857290).

Almost surely, 2^78489144 is an apocalyptic number.

It is an amenable number.

78489144 is an abundant number, since it is smaller than the sum of its proper divisors (134085816).

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

78489144 is a wasteful number, since it uses less digits than its factorization.

78489144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090139 (or 1090132 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 78489144 is about 8859.4099126296. The cubic root of 78489144 is about 428.1571467079.

It can be divided in two parts, 784 and 89144, that multiplied together give a palindrome (69888896).

The spelling of 78489144 in words is "seventy-eight million, four hundred eighty-nine thousand, one hundred forty-four".