2643145720 has 64 divisors (see below), whose sum is σ = 6403730400. Its totient is φ = 978186240.

The previous prime is 2643145679. The next prime is 2643145733. The reversal of 2643145720 is 275413462.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 7180 + ... + 73060.

Almost surely, 2^2643145720 is an apocalyptic number.

2643145720 is a gapful number since it is divisible by the number (20) 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 2643145720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3201865200).

2643145720 is an abundant number, since it is smaller than the sum of its proper divisors (3760584680).

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

2643145720 is a wasteful number, since it uses less digits than its factorization.

2643145720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65968 (or 65964 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 2643145720 is about 51411.5329473845. The cubic root of 2643145720 is about 1382.6333739852.

The spelling of 2643145720 in words is "two billion, six hundred forty-three million, one hundred forty-five thousand, seven hundred twenty".