78818784 has 96 divisors (see below), whose sum is σ = 228251520. Its totient is φ = 23616000.

The previous prime is 78818767. The next prime is 78818801. The reversal of 78818784 is 48781887.

It is an interprime number because it is at equal distance from previous prime (78818767) and next prime (78818801).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×78818784² = 12424801422477312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 106287 + ... + 107025.

It is an arithmetic number, because the mean of its divisors is an integer number (2377620).

Almost surely, 2^78818784 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 78818784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114125760).

78818784 is an abundant number, since it is smaller than the sum of its proper divisors (149432736).

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

78818784 is a wasteful number, since it uses less digits than its factorization.

78818784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 856 counting only the distinct ones).

The product of its digits is 802816, while the sum is 51.

The square root of 78818784 is about 8877.9943680991. The cubic root of 78818784 is about 428.7557033584.

The spelling of 78818784 in words is "seventy-eight million, eight hundred eighteen thousand, seven hundred eighty-four".