78645917952 has 144 divisors (see below), whose sum is σ = 265794238080. Its totient is φ = 22470248448.

The previous prime is 78645917921. The next prime is 78645917963. The reversal of 78645917952 is 25971954687.

78645917952 is a `hidden beast` number, since 7 + 8 + 6 + 459 + 179 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 78645917952.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 764343 + ... + 861110.

It is an arithmetic number, because the mean of its divisors is an integer number (1845793320).

Almost surely, 2^78645917952 is an apocalyptic number.

78645917952 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78645917952 is an abundant number, since it is smaller than the sum of its proper divisors (187148320128).

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

78645917952 is a wasteful number, since it uses less digits than its factorization.

78645917952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625485 (or 1625465 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 63.

The spelling of 78645917952 in words is "seventy-eight billion, six hundred forty-five million, nine hundred seventeen thousand, nine hundred fifty-two".