2947281638 has 32 divisors (see below), whose sum is σ = 5195086848. Its totient is φ = 1227700800.

The previous prime is 2947281637. The next prime is 2947281641. The reversal of 2947281638 is 8361827492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2947281637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146081 + ... + 165027.

It is an arithmetic number, because the mean of its divisors is an integer number (162346464).

Almost surely, 2^2947281638 is an apocalyptic number.

2947281638 is a deficient number, since it is larger than the sum of its proper divisors (2247805210).

2947281638 is a wasteful number, since it uses less digits than its factorization.

2947281638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19268.

The product of its digits is 1161216, while the sum is 50.

The square root of 2947281638 is about 54288.8721378516. The cubic root of 2947281638 is about 1433.7514808260.

The spelling of 2947281638 in words is "two billion, nine hundred forty-seven million, two hundred eighty-one thousand, six hundred thirty-eight".