4028908561 has 16 divisors (see below), whose sum is σ = 4352624640. Its totient is φ = 3717660240.

The previous prime is 4028908529. The next prime is 4028908601. The reversal of 4028908561 is 1658098204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4028908561 - 2⁵ = 4028908529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4028908511) 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, 93976 + ... + 129958.

It is an arithmetic number, because the mean of its divisors is an integer number (272039040).

Almost surely, 2^4028908561 is an apocalyptic number.

It is an amenable number.

4028908561 is a deficient number, since it is larger than the sum of its proper divisors (323716079).

4028908561 is a wasteful number, since it uses less digits than its factorization.

4028908561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36156.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 4028908561 is about 63473.6840036877. The cubic root of 4028908561 is about 1591.2159996331.

The spelling of 4028908561 in words is "four billion, twenty-eight million, nine hundred eight thousand, five hundred sixty-one".