2645037720 has 256 divisors, whose sum is σ = 9909043200. Its totient is φ = 622702080.

The previous prime is 2645037679. The next prime is 2645037737. The reversal of 2645037720 is 277305462.

It is a happy number.

2645037720 is a `hidden beast` number, since 2 + 64 + 503 + 77 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 318825 + ... + 327015.

It is an arithmetic number, because the mean of its divisors is an integer number (38707200).

Almost surely, 2^2645037720 is an apocalyptic number.

2645037720 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 2645037720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4954521600).

2645037720 is an abundant number, since it is smaller than the sum of its proper divisors (7264005480).

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

2645037720 is a wasteful number, since it uses less digits than its factorization.

2645037720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8247 (or 8237 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 2645037720 is about 51429.9301963361. The cubic root of 2645037720 is about 1382.9631979516.

The spelling of 2645037720 in words is "two billion, six hundred forty-five million, thirty-seven thousand, seven hundred twenty".