2021662640 has 40 divisors (see below), whose sum is σ = 4704810480. Its totient is φ = 807900416.

The previous prime is 2021662637. The next prime is 2021662697. The reversal of 2021662640 is 462661202.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 77327 + ... + 100113.

It is an arithmetic number, because the mean of its divisors is an integer number (117620262).

Almost surely, 2^2021662640 is an apocalyptic number.

2021662640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021662640 is an abundant number, since it is smaller than the sum of its proper divisors (2683147840).

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

2021662640 is a wasteful number, since it uses less digits than its factorization.

2021662640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23909 (or 23903 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2021662640 is about 44962.9029311943. The cubic root of 2021662640 is about 1264.4535939487.

The spelling of 2021662640 in words is "two billion, twenty-one million, six hundred sixty-two thousand, six hundred forty".