2780253549 has 6 divisors (see below), whose sum is σ = 4015921806. Its totient is φ = 1853502360.

The previous prime is 2780253533. The next prime is 2780253589. The reversal of 2780253549 is 9453520872.

2780253549 is a `hidden beast` number, since 2 + 7 + 80 + 25 + 3 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2280731049 + 499522500 = 47757^2 + 22350^2 .

It is not a de Polignac number, because 2780253549 - 2⁴ = 2780253533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780253589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154458522 + ... + 154458539.

It is an arithmetic number, because the mean of its divisors is an integer number (669320301).

Almost surely, 2^2780253549 is an apocalyptic number.

It is an amenable number.

2780253549 is a deficient number, since it is larger than the sum of its proper divisors (1235668257).

2780253549 is a wasteful number, since it uses less digits than its factorization.

2780253549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308917067 (or 308917064 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 2780253549 is about 52728.1096664768. The cubic root of 2780253549 is about 1406.1386140872.

The spelling of 2780253549 in words is "two billion, seven hundred eighty million, two hundred fifty-three thousand, five hundred forty-nine".