990721562 has 8 divisors (see below), whose sum is σ = 1496056500. Its totient is φ = 492036064.

The previous prime is 990721559. The next prime is 990721603. The reversal of 990721562 is 265127099.

990721562 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 778465801 + 212255761 = 27901^2 + 14569^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661987 + ... + 1662582.

Almost surely, 2^990721562 is an apocalyptic number.

990721562 is a deficient number, since it is larger than the sum of its proper divisors (505334938).

990721562 is a wasteful number, since it uses less digits than its factorization.

990721562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324720.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 990721562 is about 31475.7297294280. The cubic root of 990721562 is about 996.8975722289.

The spelling of 990721562 in words is "nine hundred ninety million, seven hundred twenty-one thousand, five hundred sixty-two".