2469728781 has 12 divisors (see below), whose sum is σ = 3841800508. Its totient is φ = 1519833024.

The previous prime is 2469728761. The next prime is 2469728803. The reversal of 2469728781 is 1878279642.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1586747556 + 882981225 = 39834^2 + 29715^2 .

It is not a de Polignac number, because 2469728781 - 2⁵ = 2469728749 is a prime.

It is a super-2 number, since 2×2469728781² = 12199120503399491922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2469728761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10554280 + ... + 10554513.

Almost surely, 2^2469728781 is an apocalyptic number.

It is an amenable number.

2469728781 is a deficient number, since it is larger than the sum of its proper divisors (1372071727).

2469728781 is a wasteful number, since it uses less digits than its factorization.

2469728781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21108812 (or 21108809 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 2469728781 is about 49696.3658731702. The cubic root of 2469728781 is about 1351.7086332565.

The spelling of 2469728781 in words is "two billion, four hundred sixty-nine million, seven hundred twenty-eight thousand, seven hundred eighty-one".