320725787 has 2 divisors, whose sum is σ = 320725788. Its totient is φ = 320725786.

The previous prime is 320725729. The next prime is 320725807. The reversal of 320725787 is 787527023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320725787 - 2¹⁶ = 320660251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320725387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160362893 + 160362894.

It is an arithmetic number, because the mean of its divisors is an integer number (160362894).

Almost surely, 2^320725787 is an apocalyptic number.

320725787 is a deficient number, since it is larger than the sum of its proper divisors (1).

320725787 is an equidigital number, since it uses as much as digits as its factorization.

320725787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 41.

The square root of 320725787 is about 17908.8186935934. The cubic root of 320725787 is about 684.5071041718.

The spelling of 320725787 in words is "three hundred twenty million, seven hundred twenty-five thousand, seven hundred eighty-seven".