998663649 has 8 divisors (see below), whose sum is σ = 1332305472. Its totient is φ = 665398800.

The previous prime is 998663641. The next prime is 998663669. The reversal of 998663649 is 946366899.

It is a happy number.

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

It is not a de Polignac number, because 998663649 - 2³ = 998663641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998663592 and 998663601.

It is not an unprimeable number, because it can be changed into a prime (998663641) 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, 88002 + ... + 98699.

It is an arithmetic number, because the mean of its divisors is an integer number (166538184).

Almost surely, 2^998663649 is an apocalyptic number.

It is an amenable number.

998663649 is a deficient number, since it is larger than the sum of its proper divisors (333641823).

998663649 is a wasteful number, since it uses less digits than its factorization.

998663649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188487.

The product of its digits is 15116544, while the sum is 60.

The square root of 998663649 is about 31601.6399732672. The cubic root of 998663649 is about 999.5543510932.

The spelling of 998663649 in words is "nine hundred ninety-eight million, six hundred sixty-three thousand, six hundred forty-nine".