990577729 has 4 divisors (see below), whose sum is σ = 1004529600. Its totient is φ = 976625860.

The previous prime is 990577717. The next prime is 990577741. The reversal of 990577729 is 927775099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (990577717) and next prime (990577741).

It is a cyclic number.

It is not a de Polignac number, because 990577729 - 2⁵ = 990577697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990577729.

It is not an unprimeable number, because it can be changed into a prime (990577769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6975829 + ... + 6975970.

It is an arithmetic number, because the mean of its divisors is an integer number (251132400).

Almost surely, 2^990577729 is an apocalyptic number.

It is an amenable number.

990577729 is a deficient number, since it is larger than the sum of its proper divisors (13951871).

990577729 is a wasteful number, since it uses less digits than its factorization.

990577729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13951870.

The product of its (nonzero) digits is 2500470, while the sum is 55.

The square root of 990577729 is about 31473.4448225802. Note that the first 3 decimals coincide. The cubic root of 990577729 is about 996.8493266830.

The spelling of 990577729 in words is "nine hundred ninety million, five hundred seventy-seven thousand, seven hundred twenty-nine".