906645638 has 4 divisors (see below), whose sum is σ = 1359968460. Its totient is φ = 453322818.

The previous prime is 906645637. The next prime is 906645659. The reversal of 906645638 is 836546609.

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

It is a junction number, because it is equal to n+sod(n) for n = 906645592 and 906645601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906645631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226661408 + ... + 226661411.

It is an arithmetic number, because the mean of its divisors is an integer number (339992115).

Almost surely, 2^906645638 is an apocalyptic number.

906645638 is a deficient number, since it is larger than the sum of its proper divisors (453322822).

906645638 is a wasteful number, since it uses less digits than its factorization.

906645638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453322821.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 906645638 is about 30110.5569194593. The cubic root of 906645638 is about 967.8599641187.

The spelling of 906645638 in words is "nine hundred six million, six hundred forty-five thousand, six hundred thirty-eight".