28726403 has 2 divisors, whose sum is σ = 28726404. Its totient is φ = 28726402.

The previous prime is 28726381. The next prime is 28726409. The reversal of 28726403 is 30462782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28726403 - 2⁶ = 28726339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28726403.

It is not a weakly prime, because it can be changed into another prime (28726409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14363201 + 14363202.

It is an arithmetic number, because the mean of its divisors is an integer number (14363202).

Almost surely, 2^28726403 is an apocalyptic number.

28726403 is a deficient number, since it is larger than the sum of its proper divisors (1).

28726403 is an equidigital number, since it uses as much as digits as its factorization.

28726403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28726403 is about 5359.7017640910. The cubic root of 28726403 is about 306.2624480294.

The spelling of 28726403 in words is "twenty-eight million, seven hundred twenty-six thousand, four hundred three".