108998640 has 120 divisors (see below), whose sum is σ = 373958208. Its totient is φ = 28439040.

The previous prime is 108998629. The next prime is 108998647. The reversal of 108998640 is 46899801.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108998647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32230 + ... + 35450.

Almost surely, 2^108998640 is an apocalyptic number.

108998640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 108998640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186979104).

108998640 is an abundant number, since it is smaller than the sum of its proper divisors (264959568).

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

108998640 is a wasteful number, since it uses less digits than its factorization.

108998640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3278 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 108998640 is about 10440.2413765200. The cubic root of 108998640 is about 477.6836313905.

It can be divided in two parts, 1089986 and 40, that added together give a triangular number (1090026 = T₁₄₇₆).

The spelling of 108998640 in words is "one hundred eight million, nine hundred ninety-eight thousand, six hundred forty".