2780231561100 has 288 divisors, whose sum is σ = 10752397913600. Its totient is φ = 602035027200.

The previous prime is 2780231561069. The next prime is 2780231561101. The reversal of 2780231561100 is 11651320872.

2780231561100 is a `hidden beast` number, since 2 + 7 + 8 + 0 + 2 + 31 + 5 + 611 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2780231561101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3512011 + ... + 4230210.

Almost surely, 2^{2780231561100} is an apocalyptic number.

2780231561100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780231561100 is an abundant number, since it is smaller than the sum of its proper divisors (7972166352500).

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

2780231561100 is a wasteful number, since it uses less digits than its factorization.

2780231561100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7742270 (or 7742257 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 2780231561100 its reverse (11651320872), we get a palindrome (2791882881972).

The spelling of 2780231561100 in words is "two trillion, seven hundred eighty billion, two hundred thirty-one million, five hundred sixty-one thousand, one hundred".