78324015 has 64 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 30627840.

The previous prime is 78324013. The next prime is 78324017. The reversal of 78324015 is 51042387.

78324015 = T₁₈₆ + T₁₈₇ + ... + T₇₈₀.

It is an interprime number because it is at equal distance from previous prime (78324013) and next prime (78324017).

It is not a de Polignac number, because 78324015 - 2¹ = 78324013 is a prime.

It is a super-2 number, since 2×78324015² = 12269302651440450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78324013) 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 63 ways as a sum of consecutive naturals, for example, 17641 + ... + 21629.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^78324015 is an apocalyptic number.

78324015 is an abundant number, since it is smaller than the sum of its proper divisors (87149265).

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

78324015 is a wasteful number, since it uses less digits than its factorization.

78324015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78324015 is about 8850.0855928064. The cubic root of 78324015 is about 427.8566771256.

The spelling of 78324015 in words is "seventy-eight million, three hundred twenty-four thousand, fifteen".