998811690 has 64 divisors (see below), whose sum is σ = 2429982720. Its totient is φ = 262725120.

The previous prime is 998811689. The next prime is 998811691. The reversal of 998811690 is 96118899.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (998811689) and next prime (998811691).

It is a super-2 number, since 2×998811690² = 1995249584161312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (998811691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 918327 + ... + 919413.

It is an arithmetic number, because the mean of its divisors is an integer number (37968480).

Almost surely, 2^998811690 is an apocalyptic number.

998811690 is an abundant number, since it is smaller than the sum of its proper divisors (1431171030).

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

998811690 is a wasteful number, since it uses less digits than its factorization.

998811690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 998811690 is about 31603.9821857942. The cubic root of 998811690 is about 999.6037396652.

The spelling of 998811690 in words is "nine hundred ninety-eight million, eight hundred eleven thousand, six hundred ninety".