42278643 has 24 divisors (see below), whose sum is σ = 70542576. Its totient is φ = 24115200.

The previous prime is 42278627. The next prime is 42278647. The reversal of 42278643 is 34687224.

42278643 is a `hidden beast` number, since 4 + 2 + 2 + 7 + 8 + 643 = 666.

It is not a de Polignac number, because 42278643 - 2⁴ = 42278627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42278598 and 42278607.

It is not an unprimeable number, because it can be changed into a prime (42278647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10878 + ... + 14243.

It is an arithmetic number, because the mean of its divisors is an integer number (2939274).

Almost surely, 2^42278643 is an apocalyptic number.

42278643 is a deficient number, since it is larger than the sum of its proper divisors (28263933).

42278643 is a wasteful number, since it uses less digits than its factorization.

42278643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25155 (or 25152 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 42278643 is about 6502.2029343908. The cubic root of 42278643 is about 348.3696775084.

The spelling of 42278643 in words is "forty-two million, two hundred seventy-eight thousand, six hundred forty-three".