78127705 has 4 divisors (see below), whose sum is σ = 93753252. Its totient is φ = 62502160.

The previous prime is 78127691. The next prime is 78127723. The reversal of 78127705 is 50772187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50772187 = 127 ⋅399781.

It can be written as a sum of positive squares in 2 ways, for example, as 8838729 + 69288976 = 2973^2 + 8324^2 .

It is not a de Polignac number, because 78127705 - 2¹³ = 78119513 is a prime.

It is a super-2 number, since 2×78127705² = 12207876577134050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7812766 + ... + 7812775.

It is an arithmetic number, because the mean of its divisors is an integer number (23438313).

Almost surely, 2^78127705 is an apocalyptic number.

It is an amenable number.

78127705 is a deficient number, since it is larger than the sum of its proper divisors (15625547).

78127705 is a wasteful number, since it uses less digits than its factorization.

78127705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15625546.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 78127705 is about 8838.9877814148. The cubic root of 78127705 is about 427.4989204628.

The spelling of 78127705 in words is "seventy-eight million, one hundred twenty-seven thousand, seven hundred five".