628087091 has 2 divisors, whose sum is σ = 628087092. Its totient is φ = 628087090.

The previous prime is 628087073. The next prime is 628087093. The reversal of 628087091 is 190780826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628087091 - 2²⁶ = 560978227 is a prime.

Together with 628087093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628087093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314043545 + 314043546.

It is an arithmetic number, because the mean of its divisors is an integer number (314043546).

Almost surely, 2^628087091 is an apocalyptic number.

628087091 is a deficient number, since it is larger than the sum of its proper divisors (1).

628087091 is an equidigital number, since it uses as much as digits as its factorization.

628087091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 628087091 is about 25061.6657666644. The cubic root of 628087091 is about 856.3933556769.

The spelling of 628087091 in words is "six hundred twenty-eight million, eighty-seven thousand, ninety-one".