990718825 has 6 divisors (see below), whose sum is σ = 1228491374. Its totient is φ = 792575040.

The previous prime is 990718811. The next prime is 990718829. The reversal of 990718825 is 528817099.

It can be written as a sum of positive squares in 3 ways, for example, as 15031129 + 975687696 = 3877^2 + 31236^2 .

It is not a de Polignac number, because 990718825 - 2¹⁹ = 990194537 is a prime.

It is a super-3 number, since 3×990718825³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990718829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19814352 + ... + 19814401.

Almost surely, 2^990718825 is an apocalyptic number.

It is an amenable number.

990718825 is a deficient number, since it is larger than the sum of its proper divisors (237772549).

990718825 is a wasteful number, since it uses less digits than its factorization.

990718825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39628763 (or 39628758 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 990718825 is about 31475.6862514545. The cubic root of 990718825 is about 996.8966542074.

The spelling of 990718825 in words is "nine hundred ninety million, seven hundred eighteen thousand, eight hundred twenty-five".