42878276872586 has 4 divisors (see below), whose sum is σ = 64317415308882. Its totient is φ = 21439138436292.

The previous prime is 42878276872469. The next prime is 42878276872589. The reversal of 42878276872586 is 68527867287824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22096759116961 + 20781517755625 = 4700719^2 + 4558675^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42878276872586.

It is not an unprimeable number, because it can be changed into a prime (42878276872589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10719569218145 + ... + 10719569218148.

Almost surely, 2^{42878276872586} is an apocalyptic number.

42878276872586 is a deficient number, since it is larger than the sum of its proper divisors (21439138436296).

42878276872586 is a wasteful number, since it uses less digits than its factorization.

42878276872586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439138436295.

The product of its digits is 8092385280, while the sum is 80.

The spelling of 42878276872586 in words is "forty-two trillion, eight hundred seventy-eight billion, two hundred seventy-six million, eight hundred seventy-two thousand, five hundred eighty-six".