2638928789 has 4 divisors (see below), whose sum is σ = 3015918624. Its totient is φ = 2261938956.

The previous prime is 2638928767. The next prime is 2638928821. The reversal of 2638928789 is 9878298362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2638928789 - 2²⁰ = 2637880213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638928729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188494907 + ... + 188494920.

It is an arithmetic number, because the mean of its divisors is an integer number (753979656).

Almost surely, 2^2638928789 is an apocalyptic number.

It is an amenable number.

2638928789 is a deficient number, since it is larger than the sum of its proper divisors (376989835).

2638928789 is an equidigital number, since it uses as much as digits as its factorization.

2638928789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376989834.

The product of its digits is 20901888, while the sum is 62.

The square root of 2638928789 is about 51370.5050491038. The cubic root of 2638928789 is about 1381.8976883552.

The spelling of 2638928789 in words is "two billion, six hundred thirty-eight million, nine hundred twenty-eight thousand, seven hundred eighty-nine".