998825645 has 8 divisors (see below), whose sum is σ = 1209198456. Its totient is φ = 791988736.

The previous prime is 998825609. The next prime is 998825683. The reversal of 998825645 is 546528899.

It can be written as a sum of positive squares in 4 ways, for example, as 644809 + 998180836 = 803^2 + 31594^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 998825645 - 2⁸ = 998825389 is a prime.

It is a super-3 number, since 3×998825645³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883352 + ... + 884481.

It is an arithmetic number, because the mean of its divisors is an integer number (151149807).

Almost surely, 2^998825645 is an apocalyptic number.

It is an amenable number.

998825645 is a deficient number, since it is larger than the sum of its proper divisors (210372811).

998825645 is a wasteful number, since it uses less digits than its factorization.

998825645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767951.

The product of its digits is 6220800, while the sum is 56.

The square root of 998825645 is about 31604.2029641629. The cubic root of 998825645 is about 999.6083949989.

The spelling of 998825645 in words is "nine hundred ninety-eight million, eight hundred twenty-five thousand, six hundred forty-five".