998766728 has 64 divisors (see below), whose sum is σ = 2079918000. Its totient is φ = 447455232.

The previous prime is 998766721. The next prime is 998766731. The reversal of 998766728 is 827667899.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 385808164 + 612958564 = 19642^2 + 24758^2 .

It is not an unprimeable number, because it can be changed into a prime (998766721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286178 + ... + 289646.

Almost surely, 2^998766728 is an apocalyptic number.

It is an amenable number.

998766728 is an abundant number, since it is smaller than the sum of its proper divisors (1081151272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998766728 is a wasteful number, since it uses less digits than its factorization.

998766728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594 (or 3590 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 62.

The square root of 998766728 is about 31603.2708433795. The cubic root of 998766728 is about 999.5887402219.

The spelling of 998766728 in words is "nine hundred ninety-eight million, seven hundred sixty-six thousand, seven hundred twenty-eight".