2787771540 has 24 divisors (see below), whose sum is σ = 7805760480. Its totient is φ = 743405728.

The previous prime is 2787771533. The next prime is 2787771541. The reversal of 2787771540 is 451777872.

It is a self number, because there is not a number n which added to its sum of digits gives 2787771540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787771541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23231370 + ... + 23231489.

It is an arithmetic number, because the mean of its divisors is an integer number (325240020).

Almost surely, 2^2787771540 is an apocalyptic number.

2787771540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2787771540 is an abundant number, since it is smaller than the sum of its proper divisors (5017988940).

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

2787771540 is a wasteful number, since it uses less digits than its factorization.

2787771540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46462871 (or 46462869 counting only the distinct ones).

The product of its (nonzero) digits is 768320, while the sum is 48.

The square root of 2787771540 is about 52799.3517005654. The cubic root of 2787771540 is about 1407.4049042551.

The spelling of 2787771540 in words is "two billion, seven hundred eighty-seven million, seven hundred seventy-one thousand, five hundred forty".