78127057 has 4 divisors (see below), whose sum is σ = 78161076. Its totient is φ = 78093040.

The previous prime is 78127039. The next prime is 78127061. The reversal of 78127057 is 75072187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75072187 = 17 ⋅4416011.

It can be written as a sum of positive squares in 2 ways, for example, as 13549761 + 64577296 = 3681^2 + 8036^2 .

It is a cyclic number.

It is not a de Polignac number, because 78127057 - 2¹⁹ = 77602769 is a prime.

It is a super-2 number, since 2×78127057² = 12207674070962498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78127097) 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 3 ways as a sum of consecutive naturals, for example, 13294 + ... + 18247.

It is an arithmetic number, because the mean of its divisors is an integer number (19540269).

Almost surely, 2^78127057 is an apocalyptic number.

It is an amenable number.

78127057 is a deficient number, since it is larger than the sum of its proper divisors (34019).

78127057 is a wasteful number, since it uses less digits than its factorization.

78127057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34018.

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

The square root of 78127057 is about 8838.9511255578. The cubic root of 78127057 is about 427.4977385515.

The spelling of 78127057 in words is "seventy-eight million, one hundred twenty-seven thousand, fifty-seven".