3128405655 has 32 divisors (see below), whose sum is σ = 5032108224. Its totient is φ = 1659626496.

The previous prime is 3128405633. The next prime is 3128405677. The reversal of 3128405655 is 5565048213.

It is an interprime number because it is at equal distance from previous prime (3128405633) and next prime (3128405677).

It is not a de Polignac number, because 3128405655 - 2⁹ = 3128405143 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3649987 + ... + 3650843.

It is an arithmetic number, because the mean of its divisors is an integer number (157253382).

Almost surely, 2^3128405655 is an apocalyptic number.

3128405655 is a deficient number, since it is larger than the sum of its proper divisors (1903702569).

3128405655 is a wasteful number, since it uses less digits than its factorization.

3128405655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875.

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 3128405655 is about 55932.1522471646. The cubic root of 3128405655 is about 1462.5397800561.

The spelling of 3128405655 in words is "three billion, one hundred twenty-eight million, four hundred five thousand, six hundred fifty-five".