640124029 has 2 divisors, whose sum is σ = 640124030. Its totient is φ = 640124028.

The previous prime is 640123987. The next prime is 640124039. The reversal of 640124029 is 920421046.

640124029 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467727129 + 172396900 = 21627^2 + 13130^2 .

It is a cyclic number.

It is not a de Polignac number, because 640124029 - 2²⁷ = 505906301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640123988 and 640124006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640124039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320062014 + 320062015.

It is an arithmetic number, because the mean of its divisors is an integer number (320062015).

Almost surely, 2^640124029 is an apocalyptic number.

It is an amenable number.

640124029 is a deficient number, since it is larger than the sum of its proper divisors (1).

640124029 is an equidigital number, since it uses as much as digits as its factorization.

640124029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 640124029 is about 25300.6725009435. The cubic root of 640124029 is about 861.8295416629.

The spelling of 640124029 in words is "six hundred forty million, one hundred twenty-four thousand, twenty-nine".