728644403 has 2 divisors, whose sum is σ = 728644404. Its totient is φ = 728644402.

The previous prime is 728644373. The next prime is 728644481. The reversal of 728644403 is 304446827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728644403 - 2²² = 724450099 is a prime.

It is not a weakly prime, because it can be changed into another prime (728644493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364322201 + 364322202.

It is an arithmetic number, because the mean of its divisors is an integer number (364322202).

Almost surely, 2^728644403 is an apocalyptic number.

728644403 is a deficient number, since it is larger than the sum of its proper divisors (1).

728644403 is an equidigital number, since it uses as much as digits as its factorization.

728644403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 728644403 is about 26993.4140671387. The cubic root of 728644403 is about 899.8536399859.

The spelling of 728644403 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, four hundred three".