42810730906 has 4 divisors (see below), whose sum is σ = 64216096362. Its totient is φ = 21405365452.

The previous prime is 42810730819. The next prime is 42810730943. The reversal of 42810730906 is 60903701824.

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., 40545446881 + 2265284025 = 201359^2 + 47595^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702682725 + ... + 10702682728.

Almost surely, 2^42810730906 is an apocalyptic number.

42810730906 is a deficient number, since it is larger than the sum of its proper divisors (21405365456).

42810730906 is a wasteful number, since it uses less digits than its factorization.

42810730906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21405365455.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 42810730906 in words is "forty-two billion, eight hundred ten million, seven hundred thirty thousand, nine hundred six".