990788617 has 8 divisors (see below), whose sum is σ = 1219432256. Its totient is φ = 783920592.

The previous prime is 990788597. The next prime is 990788629. The reversal of 990788617 is 716887099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990788617 - 2¹⁵ = 990755849 is a prime.

It is a super-3 number, since 3×990788617³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (990788647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5443803 + ... + 5443984.

It is an arithmetic number, because the mean of its divisors is an integer number (152429032).

Almost surely, 2^990788617 is an apocalyptic number.

It is an amenable number.

990788617 is a deficient number, since it is larger than the sum of its proper divisors (228643639).

990788617 is a wasteful number, since it uses less digits than its factorization.

990788617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10887807.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 990788617 is about 31476.7948971937. The cubic root of 990788617 is about 996.9200627252.

The spelling of 990788617 in words is "nine hundred ninety million, seven hundred eighty-eight thousand, six hundred seventeen".