69728251 has 2 divisors, whose sum is σ = 69728252. Its totient is φ = 69728250.

The previous prime is 69728227. The next prime is 69728261. The reversal of 69728251 is 15282796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69728251 - 2⁷ = 69728123 is a prime.

It is not a weakly prime, because it can be changed into another prime (69728221) 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, 34864125 + 34864126.

It is an arithmetic number, because the mean of its divisors is an integer number (34864126).

Almost surely, 2^69728251 is an apocalyptic number.

69728251 is a deficient number, since it is larger than the sum of its proper divisors (1).

69728251 is an equidigital number, since it uses as much as digits as its factorization.

69728251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 69728251 is about 8350.3443641565. The cubic root of 69728251 is about 411.5945263796.

The spelling of 69728251 in words is "sixty-nine million, seven hundred twenty-eight thousand, two hundred fifty-one".