3128503781 has 8 divisors (see below), whose sum is σ = 3370345440. Its totient is φ = 2886831792.

The previous prime is 3128503757. The next prime is 3128503813. The reversal of 3128503781 is 1873058213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3128503781 - 2¹⁸ = 3128241637 is a prime.

It is a super-2 number, since 2×3128503781² = 19575071815462591922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128502781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2735 + ... + 79148.

It is an arithmetic number, because the mean of its divisors is an integer number (421293180).

Almost surely, 2^3128503781 is an apocalyptic number.

It is an amenable number.

3128503781 is a deficient number, since it is larger than the sum of its proper divisors (241841659).

3128503781 is a wasteful number, since it uses less digits than its factorization.

3128503781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84835.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 3128503781 is about 55933.0294280580. The cubic root of 3128503781 is about 1462.5550713039. Note that the first 3 decimals are identical.

The spelling of 3128503781 in words is "three billion, one hundred twenty-eight million, five hundred three thousand, seven hundred eighty-one".