18100640 has 96 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 6759424.

The previous prime is 18100633. The next prime is 18100651. The reversal of 18100640 is 4600181.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218039 + ... + 218121.

It is an arithmetic number, because the mean of its divisors is an integer number (476280).

Almost surely, 2^18100640 is an apocalyptic number.

18100640 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 18100640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22861440).

18100640 is an abundant number, since it is smaller than the sum of its proper divisors (27622240).

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

18100640 is a wasteful number, since it uses less digits than its factorization.

18100640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18100640 is about 4254.4846926508. The cubic root of 18100640 is about 262.5616604961.

The spelling of 18100640 in words is "eighteen million, one hundred thousand, six hundred forty".