628231757 has 2 divisors, whose sum is σ = 628231758. Its totient is φ = 628231756.

The previous prime is 628231733. The next prime is 628231819. The reversal of 628231757 is 757132826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565916521 + 62315236 = 23789^2 + 7894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628231757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628231717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314115878 + 314115879.

It is an arithmetic number, because the mean of its divisors is an integer number (314115879).

Almost surely, 2^628231757 is an apocalyptic number.

It is an amenable number.

628231757 is a deficient number, since it is larger than the sum of its proper divisors (1).

628231757 is an equidigital number, since it uses as much as digits as its factorization.

628231757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 628231757 is about 25064.5518012990. The cubic root of 628231757 is about 856.4591010660.

The spelling of 628231757 in words is "six hundred twenty-eight million, two hundred thirty-one thousand, seven hundred fifty-seven".