2745761780 has 18 divisors (see below), whose sum is σ = 5766591894. Its totient is φ = 1098210976.

The previous prime is 2745761741. The next prime is 2745761819. The reversal of 2745761780 is 871675472.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2745761741) and next prime (2745761819).

It can be written as a sum of positive squares in 3 ways, for example, as 413064976 + 2332696804 = 20324^2 + 48298^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228482 + ... + 240198.

Almost surely, 2^2745761780 is an apocalyptic number.

2745761780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2745761780 is an abundant number, since it is smaller than the sum of its proper divisors (3020830114).

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

2745761780 is an frugal number, since it uses more digits than its factorization.

2745761780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23443 (or 11724 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 2745761780 is about 52400.0169847301. The cubic root of 2745761780 is about 1400.2995583478.

The spelling of 2745761780 in words is "two billion, seven hundred forty-five million, seven hundred sixty-one thousand, seven hundred eighty".