127778545 has 16 divisors (see below), whose sum is σ = 163216080. Its totient is φ = 95698944.

The previous prime is 127778537. The next prime is 127778551. The reversal of 127778545 is 545877721.

It can be written as a sum of positive squares in 8 ways, for example, as 20736 + 127757809 = 144^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 127778545 - 2³ = 127778537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127778495 and 127778504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12511 + ... + 20299.

It is an arithmetic number, because the mean of its divisors is an integer number (10201005).

Almost surely, 2^127778545 is an apocalyptic number.

It is an amenable number.

127778545 is a deficient number, since it is larger than the sum of its proper divisors (35437535).

127778545 is a wasteful number, since it uses less digits than its factorization.

127778545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004.

The product of its digits is 548800, while the sum is 46.

The square root of 127778545 is about 11303.9172413814. The cubic root of 127778545 is about 503.6776107069.

The spelling of 127778545 in words is "one hundred twenty-seven million, seven hundred seventy-eight thousand, five hundred forty-five".