2989881657 has 18 divisors (see below), whose sum is σ = 5023815498. Its totient is φ = 1708503552.

The previous prime is 2989881617. The next prime is 2989881673. The reversal of 2989881657 is 7561889892.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1915287696 + 1074593961 = 43764^2 + 32781^2 .

It is not a de Polignac number, because 2989881657 - 2⁶ = 2989881593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 2989881594 and 2989881603.

It is not an unprimeable number, because it can be changed into a prime (2989881617) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3389448 + ... + 3390329.

It is an arithmetic number, because the mean of its divisors is an integer number (279100861).

Almost surely, 2^2989881657 is an apocalyptic number.

It is an amenable number.

2989881657 is a deficient number, since it is larger than the sum of its proper divisors (2033933841).

2989881657 is a wasteful number, since it uses less digits than its factorization.

2989881657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779797 (or 6779787 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The square root of 2989881657 is about 54679.8103233726. The cubic root of 2989881657 is about 1440.6262799536.

The spelling of 2989881657 in words is "two billion, nine hundred eighty-nine million, eight hundred eighty-one thousand, six hundred fifty-seven".