628989937 has 2 divisors, whose sum is σ = 628989938. Its totient is φ = 628989936.

The previous prime is 628989917. The next prime is 628989983. The reversal of 628989937 is 739989826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390102001 + 238887936 = 19751^2 + 15456^2 .

It is a cyclic number.

It is not a de Polignac number, because 628989937 - 2¹¹ = 628987889 is a prime.

It is not a weakly prime, because it can be changed into another prime (628989917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314494968 + 314494969.

It is an arithmetic number, because the mean of its divisors is an integer number (314494969).

Almost surely, 2^628989937 is an apocalyptic number.

It is an amenable number.

628989937 is a deficient number, since it is larger than the sum of its proper divisors (1).

628989937 is an equidigital number, since it uses as much as digits as its factorization.

628989937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 61.

The square root of 628989937 is about 25079.6717881235. The cubic root of 628989937 is about 856.8035010993.

It can be divided in two parts, 628989 and 937, that added together give a palindrome (629926).

The spelling of 628989937 in words is "six hundred twenty-eight million, nine hundred eighty-nine thousand, nine hundred thirty-seven".