2781457947 has 56 divisors (see below), whose sum is σ = 4347954000. Its totient is φ = 1776333888.

The previous prime is 2781457897. The next prime is 2781457949. The reversal of 2781457947 is 7497541872.

2781457947 is a `hidden beast` number, since 27 + 8 + 1 + 4 + 579 + 47 = 666.

It is not a de Polignac number, because 2781457947 - 2⁶ = 2781457883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2781457893 and 2781457902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781457949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3149568 + ... + 3150450.

Almost surely, 2^2781457947 is an apocalyptic number.

2781457947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2781457947 is a deficient number, since it is larger than the sum of its proper divisors (1566496053).

2781457947 is an equidigital number, since it uses as much as digits as its factorization.

2781457947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1064 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 2781457947 is about 52739.5292641108. The cubic root of 2781457947 is about 1406.3416298694.

The spelling of 2781457947 in words is "two billion, seven hundred eighty-one million, four hundred fifty-seven thousand, nine hundred forty-seven".