78989520 has 40 divisors (see below), whose sum is σ = 244868256. Its totient is φ = 21063808.

The previous prime is 78989513. The next prime is 78989539. The reversal of 78989520 is 2598987.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 78989520.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 164322 + ... + 164801.

Almost surely, 2^78989520 is an apocalyptic number.

It is an amenable number.

78989520 is an abundant number, since it is smaller than the sum of its proper divisors (165878736).

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

78989520 is a wasteful number, since it uses less digits than its factorization.

78989520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329139 (or 329133 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 78989520 is about 8887.6048517022. The cubic root of 78989520 is about 429.0650680206.

It can be divided in two parts, 789 and 89520, that added together give a palindrome (90309).

The spelling of 78989520 in words is "seventy-eight million, nine hundred eighty-nine thousand, five hundred twenty".