3021257640 has 128 divisors (see below), whose sum is σ = 9629136000. Its totient is φ = 756200448.

The previous prime is 3021257627. The next prime is 3021257647. The reversal of 3021257640 is 467521203.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3021257598 and 3021257607.

It is not an unprimeable number, because it can be changed into a prime (3021257647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242442 + ... + 254598.

It is an arithmetic number, because the mean of its divisors is an integer number (75227625).

Almost surely, 2^3021257640 is an apocalyptic number.

3021257640 is a gapful number since it is divisible by the number (30) 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 3021257640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4814568000).

3021257640 is an abundant number, since it is smaller than the sum of its proper divisors (6607878360).

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

3021257640 is a wasteful number, since it uses less digits than its factorization.

3021257640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12299 (or 12295 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 3021257640 is about 54965.9680165828. The cubic root of 3021257640 is about 1445.6480915266.

Adding to 3021257640 its reverse (467521203), we get a palindrome (3488778843).

The spelling of 3021257640 in words is "three billion, twenty-one million, two hundred fifty-seven thousand, six hundred forty".