4012020640 has 144 divisors (see below), whose sum is σ = 10023598368. Its totient is φ = 1517255168.

The previous prime is 4012020629. The next prime is 4012020653. The reversal of 4012020640 is 460202104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9056259 + ... + 9056701.

It is an arithmetic number, because the mean of its divisors is an integer number (69608322).

Almost surely, 2^4012020640 is an apocalyptic number.

4012020640 is a gapful number since it is divisible by the number (40) 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 4012020640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5011799184).

4012020640 is an abundant number, since it is smaller than the sum of its proper divisors (6011577728).

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

4012020640 is a wasteful number, since it uses less digits than its factorization.

4012020640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4012020640 is about 63340.5134175592. The cubic root of 4012020640 is about 1588.9895931376.

Adding to 4012020640 its reverse (460202104), we get a palindrome (4472222744).

The spelling of 4012020640 in words is "four billion, twelve million, twenty thousand, six hundred forty".