1000220640 has 96 divisors (see below), whose sum is σ = 3181441536. Its totient is φ = 264122880.

The previous prime is 1000220623. The next prime is 1000220651. The reversal of 1000220640 is 460220001.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39325 + ... + 59555.

It is an arithmetic number, because the mean of its divisors is an integer number (33140016).

Almost surely, 2^1000220640 is an apocalyptic number.

1000220640 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 1000220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590720768).

1000220640 is an abundant number, since it is smaller than the sum of its proper divisors (2181220896).

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

1000220640 is a wasteful number, since it uses less digits than its factorization.

1000220640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352 (or 20344 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1000220640 is about 31626.2650339872. The cubic root of 1000220640 is about 1000.0735412582.

Adding to 1000220640 its reverse (460220001), we get a palindrome (1460440641).

The spelling of 1000220640 in words is "one billion, two hundred twenty thousand, six hundred forty".