2545770640 has 160 divisors (see below), whose sum is σ = 7096688640. Its totient is φ = 830387712.

The previous prime is 2545770637. The next prime is 2545770649. The reversal of 2545770640 is 460775452.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2545770593 and 2545770602.

It is not an unprimeable number, because it can be changed into a prime (2545770649) 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, 3077907 + ... + 3078733.

It is an arithmetic number, because the mean of its divisors is an integer number (44354304).

Almost surely, 2^2545770640 is an apocalyptic number.

2545770640 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 2545770640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3548344320).

2545770640 is an abundant number, since it is smaller than the sum of its proper divisors (4550918000).

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

2545770640 is a wasteful number, since it uses less digits than its factorization.

2545770640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 2545770640 is about 50455.6304093012. The cubic root of 2545770640 is about 1365.4414776866.

The spelling of 2545770640 in words is "two billion, five hundred forty-five million, seven hundred seventy thousand, six hundred forty".