78125005 has 16 divisors (see below), whose sum is σ = 107581824. Its totient is φ = 53352000.

The previous prime is 78124999. The next prime is 78125041. The reversal of 78125005 is 50052187.

It is not a de Polignac number, because 78125005 - 2⁵ = 78124973 is a prime.

It is a super-2 number, since 2×78125005² = 12207032812500050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 4339 + ... + 13231.

It is an arithmetic number, because the mean of its divisors is an integer number (6723864).

Almost surely, 2^78125005 is an apocalyptic number.

It is an amenable number.

78125005 is a deficient number, since it is larger than the sum of its proper divisors (29456819).

78125005 is a wasteful number, since it uses less digits than its factorization.

78125005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9156.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 78125005 is about 8838.8350476746. The cubic root of 78125005 is about 427.4939957890.

It can be divided in two parts, 7812500 and 5, that multiplied together give a square (39062500 = 6250²).

The spelling of 78125005 in words is "seventy-eight million, one hundred twenty-five thousand, five".