628903291 has 2 divisors, whose sum is σ = 628903292. Its totient is φ = 628903290.

The previous prime is 628903277. The next prime is 628903313. The reversal of 628903291 is 192309826.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628903291 - 2¹¹ = 628901243 is a prime.

It is a super-3 number, since 3×628903291³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (628903991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314451645 + 314451646.

It is an arithmetic number, because the mean of its divisors is an integer number (314451646).

Almost surely, 2^628903291 is an apocalyptic number.

628903291 is a deficient number, since it is larger than the sum of its proper divisors (1).

628903291 is an equidigital number, since it uses as much as digits as its factorization.

628903291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 628903291 is about 25077.9443136793. The cubic root of 628903291 is about 856.7641565349.

The spelling of 628903291 in words is "six hundred twenty-eight million, nine hundred three thousand, two hundred ninety-one".