78055015 has 24 divisors (see below), whose sum is σ = 98802432. Its totient is φ = 59152320.

The previous prime is 78055013. The next prime is 78055039. The reversal of 78055015 is 51055087.

It is not a de Polignac number, because 78055015 - 2¹ = 78055013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78055013) 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 23 ways as a sum of consecutive naturals, for example, 408570 + ... + 408760.

It is an arithmetic number, because the mean of its divisors is an integer number (4116768).

Almost surely, 2^78055015 is an apocalyptic number.

78055015 is a deficient number, since it is larger than the sum of its proper divisors (20747417).

78055015 is a wasteful number, since it uses less digits than its factorization.

78055015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 78055015 is about 8834.8749283733. The cubic root of 78055015 is about 427.3662976889.

The spelling of 78055015 in words is "seventy-eight million, fifty-five thousand, fifteen".