78315536 has 40 divisors (see below), whose sum is σ = 166905984. Its totient is φ = 35372160.

The previous prime is 78315509. The next prime is 78315551. The reversal of 78315536 is 63551387.

It is a super-2 number, since 2×78315536² = 12266646357934592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78315536.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5771 + ... + 13781.

Almost surely, 2^78315536 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 78315536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83452992).

78315536 is an abundant number, since it is smaller than the sum of its proper divisors (88590448).

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

78315536 is a wasteful number, since it uses less digits than its factorization.

78315536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8079 (or 8073 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 78315536 is about 8849.6065449262. The cubic root of 78315536 is about 427.8412372988.

The spelling of 78315536 in words is "seventy-eight million, three hundred fifteen thousand, five hundred thirty-six".