78515073 has 48 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 40279680.

The previous prime is 78515071. The next prime is 78515081. The reversal of 78515073 is 37051587.

78515073 is a `hidden beast` number, since 78 + 515 + 0 + 73 = 666.

It is not a de Polignac number, because 78515073 - 2¹ = 78515071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78515071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29008 + ... + 31598.

It is an arithmetic number, because the mean of its divisors is an integer number (2987712).

Almost surely, 2^78515073 is an apocalyptic number.

It is an amenable number.

78515073 is a deficient number, since it is larger than the sum of its proper divisors (64895103).

78515073 is a wasteful number, since it uses less digits than its factorization.

78515073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654 (or 2651 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 78515073 is about 8860.8731511065. The cubic root of 78515073 is about 428.2042889573.

The spelling of 78515073 in words is "seventy-eight million, five hundred fifteen thousand, seventy-three".