2645877780 has 144 divisors (see below), whose sum is σ = 9878004864. Its totient is φ = 558247680.

The previous prime is 2645877779. The next prime is 2645877821. The reversal of 2645877780 is 877785462.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64386 + ... + 97145.

It is an arithmetic number, because the mean of its divisors is an integer number (68597256).

Almost surely, 2^2645877780 is an apocalyptic number.

2645877780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2645877780 is an abundant number, since it is smaller than the sum of its proper divisors (7232127084).

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

2645877780 is a wasteful number, since it uses less digits than its factorization.

2645877780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161566 (or 161561 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 54.

The square root of 2645877780 is about 51438.0965822026. The cubic root of 2645877780 is about 1383.1095914649.

The spelling of 2645877780 in words is "two billion, six hundred forty-five million, eight hundred seventy-seven thousand, seven hundred eighty".