2745273640 has 32 divisors (see below), whose sum is σ = 6191575560. Its totient is φ = 1095494400.

The previous prime is 2745273623. The next prime is 2745273647. The reversal of 2745273640 is 463725472.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 337016164 + 2408257476 = 18358^2 + 49074^2 .

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 = 2745273593 and 2745273602.

It is not an unprimeable number, because it can be changed into a prime (2745273647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 64671 + ... + 98350.

Almost surely, 2^2745273640 is an apocalyptic number.

2745273640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2745273640 is an abundant number, since it is smaller than the sum of its proper divisors (3446301920).

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

2745273640 is a wasteful number, since it uses less digits than its factorization.

2745273640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163453 (or 163449 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 40.

The square root of 2745273640 is about 52395.3589547777. The cubic root of 2745273640 is about 1400.2165719380.

The spelling of 2745273640 in words is "two billion, seven hundred forty-five million, two hundred seventy-three thousand, six hundred forty".