42778545 has 16 divisors (see below), whose sum is σ = 72472320. Its totient is φ = 21473024.

The previous prime is 42778517. The next prime is 42778559. The reversal of 42778545 is 54587724.

It is a cyclic number.

It is not a de Polignac number, because 42778545 - 2⁵ = 42778513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42778497 and 42778506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83625 + ... + 84134.

It is an arithmetic number, because the mean of its divisors is an integer number (4529520).

Almost surely, 2^42778545 is an apocalyptic number.

It is an amenable number.

42778545 is a deficient number, since it is larger than the sum of its proper divisors (29693775).

42778545 is a wasteful number, since it uses less digits than its factorization.

42778545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167784.

The product of its digits is 313600, while the sum is 42.

The square root of 42778545 is about 6540.5309417508. The cubic root of 42778545 is about 349.7373403497.

The spelling of 42778545 in words is "forty-two million, seven hundred seventy-eight thousand, five hundred forty-five".