42278769 has 12 divisors (see below), whose sum is σ = 65767156. Its totient is φ = 26017632.

The previous prime is 42278759. The next prime is 42278783. The reversal of 42278769 is 96787224.

42278769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8928144 + 33350625 = 2988^2 + 5775^2 .

It is not a de Polignac number, because 42278769 - 2⁵ = 42278737 is a prime.

It is a super-2 number, since 2×42278769² = 3574988616310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42278759) 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 11 ways as a sum of consecutive naturals, for example, 180562 + ... + 180795.

Almost surely, 2^42278769 is an apocalyptic number.

It is an amenable number.

42278769 is a deficient number, since it is larger than the sum of its proper divisors (23488387).

42278769 is a wasteful number, since it uses less digits than its factorization.

42278769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361376 (or 361373 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 42278769 is about 6502.2126234075. The cubic root of 42278769 is about 348.3700235817.

It can be divided in two parts, 4227 and 8769, that added together give a square (12996 = 114²).

The spelling of 42278769 in words is "forty-two million, two hundred seventy-eight thousand, seven hundred sixty-nine".