78619689252 has 72 divisors (see below), whose sum is σ = 214225240320. Its totient is φ = 24167505600.

The previous prime is 78619689241. The next prime is 78619689259. The reversal of 78619689252 is 25298691687.

78619689252 is a `hidden beast` number, since 7 + 8 + 619 + 6 + 8 + 9 + 2 + 5 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 78619689252.

It is not an unprimeable number, because it can be changed into a prime (78619689259) 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 23 ways as a sum of consecutive naturals, for example, 411949 + ... + 571787.

It is an arithmetic number, because the mean of its divisors is an integer number (2975350560).

Almost surely, 2^78619689252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78619689252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107112620160).

78619689252 is an abundant number, since it is smaller than the sum of its proper divisors (135605551068).

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

78619689252 is a wasteful number, since it uses less digits than its factorization.

78619689252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160913 (or 160908 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 78619689252 in words is "seventy-eight billion, six hundred nineteen million, six hundred eighty-nine thousand, two hundred fifty-two".