990717305 has 8 divisors (see below), whose sum is σ = 1189060992. Its totient is φ = 792440368.

The previous prime is 990717289. The next prime is 990717307. The reversal of 990717305 is 503717099.

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

It is a cyclic number.

It is not a de Polignac number, because 990717305 - 2⁴ = 990717289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990717307) 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, 25814 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (148632624).

Almost surely, 2^990717305 is an apocalyptic number.

It is an amenable number.

990717305 is a deficient number, since it is larger than the sum of its proper divisors (198343687).

990717305 is a wasteful number, since it uses less digits than its factorization.

990717305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33375.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 990717305 is about 31475.6621058239. The cubic root of 990717305 is about 996.8961443811.

The spelling of 990717305 in words is "nine hundred ninety million, seven hundred seventeen thousand, three hundred five".