990207647 has 16 divisors (see below), whose sum is σ = 1172223360. Its totient is φ = 824584800.

The previous prime is 990207643. The next prime is 990207649. The reversal of 990207647 is 746702099.

It is not a de Polignac number, because 990207647 - 2² = 990207643 is a prime.

It is a super-2 number, since 2×990207647² = 1961022368354553218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 990207598 and 990207607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990207643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7697 + ... + 45162.

It is an arithmetic number, because the mean of its divisors is an integer number (73263960).

Almost surely, 2^990207647 is an apocalyptic number.

990207647 is a deficient number, since it is larger than the sum of its proper divisors (182015713).

990207647 is a wasteful number, since it uses less digits than its factorization.

990207647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53014.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 990207647 is about 31467.5649995356. The cubic root of 990207647 is about 996.7251695257.

The spelling of 990207647 in words is "nine hundred ninety million, two hundred seven thousand, six hundred forty-seven".