42785729387 has 4 divisors (see below), whose sum is σ = 45302537016. Its totient is φ = 40268921760.

The previous prime is 42785729341. The next prime is 42785729411. The reversal of 42785729387 is 78392758724.

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

It is a cyclic number.

It is not a de Polignac number, because 42785729387 - 2¹² = 42785725291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42785729317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258403789 + ... + 1258403822.

It is an arithmetic number, because the mean of its divisors is an integer number (11325634254).

Almost surely, 2^42785729387 is an apocalyptic number.

42785729387 is a deficient number, since it is larger than the sum of its proper divisors (2516807629).

42785729387 is a wasteful number, since it uses less digits than its factorization.

42785729387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516807628.

The product of its digits is 47416320, while the sum is 62.

The spelling of 42785729387 in words is "forty-two billion, seven hundred eighty-five million, seven hundred twenty-nine thousand, three hundred eighty-seven".