2638928731 has 2 divisors, whose sum is σ = 2638928732. Its totient is φ = 2638928730.

The previous prime is 2638928729. The next prime is 2638928767. The reversal of 2638928731 is 1378298362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2638928731 - 2¹ = 2638928729 is a prime.

It is a super-2 number, since 2×2638928731² = 13927889694594540722, which contains 22 as substring.

Together with 2638928729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2638928431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319464365 + 1319464366.

It is an arithmetic number, because the mean of its divisors is an integer number (1319464366).

Almost surely, 2^2638928731 is an apocalyptic number.

2638928731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638928731 is an equidigital number, since it uses as much as digits as its factorization.

2638928731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 2638928731 is about 51370.5044845775. The cubic root of 2638928731 is about 1381.8976782311.

The spelling of 2638928731 in words is "two billion, six hundred thirty-eight million, nine hundred twenty-eight thousand, seven hundred thirty-one".