990217995 has 32 divisors (see below), whose sum is σ = 1727846400. Its totient is φ = 481313664.

The previous prime is 990217993. The next prime is 990217999. The reversal of 990217995 is 599712099.

It is not a de Polignac number, because 990217995 - 2¹ = 990217993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990217993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16735 + ... + 47544.

It is an arithmetic number, because the mean of its divisors is an integer number (53995200).

Almost surely, 2^990217995 is an apocalyptic number.

990217995 is a deficient number, since it is larger than the sum of its proper divisors (737628405).

990217995 is a wasteful number, since it uses less digits than its factorization.

990217995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64379.

The product of its (nonzero) digits is 459270, while the sum is 51.

The square root of 990217995 is about 31467.7294223781. The cubic root of 990217995 is about 996.7286415504.

The spelling of 990217995 in words is "nine hundred ninety million, two hundred seventeen thousand, nine hundred ninety-five".