628428403 has 2 divisors, whose sum is σ = 628428404. Its totient is φ = 628428402.

The previous prime is 628428349. The next prime is 628428419. The reversal of 628428403 is 304824826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628428403 - 2¹⁷ = 628297331 is a prime.

It is not a weakly prime, because it can be changed into another prime (628428503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314214201 + 314214202.

It is an arithmetic number, because the mean of its divisors is an integer number (314214202).

Almost surely, 2^628428403 is an apocalyptic number.

628428403 is a deficient number, since it is larger than the sum of its proper divisors (1).

628428403 is an equidigital number, since it uses as much as digits as its factorization.

628428403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 628428403 is about 25068.4742854447. The cubic root of 628428403 is about 856.5484532756.

The spelling of 628428403 in words is "six hundred twenty-eight million, four hundred twenty-eight thousand, four hundred three".