78489140 has 12 divisors (see below), whose sum is σ = 164827236. Its totient is φ = 31395648.

The previous prime is 78489113. The next prime is 78489143. The reversal of 78489140 is 4198487.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58094884 + 20394256 = 7622^2 + 4516^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 1962209 + ... + 1962248.

It is an arithmetic number, because the mean of its divisors is an integer number (13735603).

Almost surely, 2^78489140 is an apocalyptic number.

It is an amenable number.

78489140 is an abundant number, since it is smaller than the sum of its proper divisors (86338096).

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

78489140 is a wasteful number, since it uses less digits than its factorization.

78489140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924466 (or 3924464 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78489140 is about 8859.4096868809. The cubic root of 78489140 is about 428.1571394346.

The spelling of 78489140 in words is "seventy-eight million, four hundred eighty-nine thousand, one hundred forty".