2128639737 has 16 divisors (see below), whose sum is σ = 3245929472. Its totient is φ = 1215507600.

The previous prime is 2128639687. The next prime is 2128639783. The reversal of 2128639737 is 7379368212.

It is not a de Polignac number, because 2128639737 - 2⁸ = 2128639481 is a prime.

It is a super-2 number, since 2×2128639737² = 9062214259870858338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128639537) 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, 4639 + ... + 65412.

It is an arithmetic number, because the mean of its divisors is an integer number (202870592).

Almost surely, 2^2128639737 is an apocalyptic number.

It is an amenable number.

2128639737 is a deficient number, since it is larger than the sum of its proper divisors (1117289735).

2128639737 is a wasteful number, since it uses less digits than its factorization.

2128639737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71508.

The product of its digits is 762048, while the sum is 48.

The square root of 2128639737 is about 46137.1838867523. The cubic root of 2128639737 is about 1286.3743992917.

The spelling of 2128639737 in words is "two billion, one hundred twenty-eight million, six hundred thirty-nine thousand, seven hundred thirty-seven".