990671605 has 32 divisors (see below), whose sum is σ = 1487063808. Its totient is φ = 615513600.

The previous prime is 990671603. The next prime is 990671611. The reversal of 990671605 is 506176099.

It is not a de Polignac number, because 990671605 - 2¹ = 990671603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990671603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116395 + ... + 124615.

It is an arithmetic number, because the mean of its divisors is an integer number (46470744).

Almost surely, 2^990671605 is an apocalyptic number.

It is an amenable number.

990671605 is a deficient number, since it is larger than the sum of its proper divisors (496392203).

990671605 is a wasteful number, since it uses less digits than its factorization.

990671605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 990671605 is about 31474.9361397287. The cubic root of 990671605 is about 996.8808158058.

The spelling of 990671605 in words is "nine hundred ninety million, six hundred seventy-one thousand, six hundred five".