1278877545 has 64 divisors (see below), whose sum is σ = 2527200000. Its totient is φ = 608325120.

The previous prime is 1278877543. The next prime is 1278877549. The reversal of 1278877545 is 5457788721.

1278877545 is a `hidden beast` number, since 1 + 27 + 8 + 8 + 77 + 545 = 666.

1278877545 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1278877545 - 2¹ = 1278877543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278877491 and 1278877500.

It is not an unprimeable number, because it can be changed into a prime (1278877543) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70581 + ... + 86829.

It is an arithmetic number, because the mean of its divisors is an integer number (39487500).

Almost surely, 2^1278877545 is an apocalyptic number.

1278877545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278877545 is a deficient number, since it is larger than the sum of its proper divisors (1248322455).

1278877545 is a wasteful number, since it uses less digits than its factorization.

1278877545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16327 (or 16321 counting only the distinct ones).

The product of its digits is 4390400, while the sum is 54.

The square root of 1278877545 is about 35761.3974139714. The cubic root of 1278877545 is about 1085.4495776107.

The spelling of 1278877545 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-seven thousand, five hundred forty-five".