870905906 has 16 divisors (see below), whose sum is σ = 1429913688. Its totient is φ = 395366400.

The previous prime is 870905899. The next prime is 870905921. The reversal of 870905906 is 609509078.

It can be written as a sum of positive squares in 4 ways, for example, as 632975281 + 237930625 = 25159^2 + 15425^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272975 + ... + 276146.

Almost surely, 2^870905906 is an apocalyptic number.

870905906 is a deficient number, since it is larger than the sum of its proper divisors (559007782).

870905906 is a wasteful number, since it uses less digits than its factorization.

870905906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549197.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 870905906 is about 29511.1149569107. The cubic root of 870905906 is about 954.9715024893.

The spelling of 870905906 in words is "eight hundred seventy million, nine hundred five thousand, nine hundred six".