728212907 has 2 divisors, whose sum is σ = 728212908. Its totient is φ = 728212906.

The previous prime is 728212889. The next prime is 728212949. The reversal of 728212907 is 709212827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728212907 - 2²⁰ = 727164331 is a prime.

It is not a weakly prime, because it can be changed into another prime (728212007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364106453 + 364106454.

It is an arithmetic number, because the mean of its divisors is an integer number (364106454).

Almost surely, 2^728212907 is an apocalyptic number.

728212907 is a deficient number, since it is larger than the sum of its proper divisors (1).

728212907 is an equidigital number, since it uses as much as digits as its factorization.

728212907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 728212907 is about 26985.4202672480. The cubic root of 728212907 is about 899.6759767729.

The spelling of 728212907 in words is "seven hundred twenty-eight million, two hundred twelve thousand, nine hundred seven".