988989690 has 96 divisors (see below), whose sum is σ = 2597990976. Its totient is φ = 240814080.

The previous prime is 988989667. The next prime is 988989709. The reversal of 988989690 is 96989889.

It is a super-2 number, since 2×988989690² = 1956201213852592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 490785 + ... + 492795.

It is an arithmetic number, because the mean of its divisors is an integer number (27062406).

Almost surely, 2^988989690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 988989690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1298995488).

988989690 is an abundant number, since it is smaller than the sum of its proper divisors (1609001286).

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

988989690 is a wasteful number, since it uses less digits than its factorization.

988989690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 66.

The square root of 988989690 is about 31448.2064671421. The cubic root of 988989690 is about 996.3163440068.

The spelling of 988989690 in words is "nine hundred eighty-eight million, nine hundred eighty-nine thousand, six hundred ninety".