78318552 has 64 divisors (see below), whose sum is σ = 211841280. Its totient is φ = 23985792.

The previous prime is 78318517. The next prime is 78318553. The reversal of 78318552 is 25581387.

It is a super-2 number, since 2×78318552² = 12267591174753408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 78318552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78318553) 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 15 ways as a sum of consecutive naturals, for example, 87853 + ... + 88739.

It is an arithmetic number, because the mean of its divisors is an integer number (3310020).

Almost surely, 2^78318552 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 78318552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105920640).

78318552 is an abundant number, since it is smaller than the sum of its proper divisors (133522728).

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

78318552 is a wasteful number, since it uses less digits than its factorization.

78318552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1188 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 78318552 is about 8849.7769463416. The cubic root of 78318552 is about 427.8467294087.

The spelling of 78318552 in words is "seventy-eight million, three hundred eighteen thousand, five hundred fifty-two".