628961507 has 2 divisors, whose sum is σ = 628961508. Its totient is φ = 628961506.

The previous prime is 628961479. The next prime is 628961521. The reversal of 628961507 is 705169826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628961507 - 2¹² = 628957411 is a prime.

It is a super-2 number, since 2×628961507² = 791185154575422098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628961527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314480753 + 314480754.

It is an arithmetic number, because the mean of its divisors is an integer number (314480754).

Almost surely, 2^628961507 is an apocalyptic number.

628961507 is a deficient number, since it is larger than the sum of its proper divisors (1).

628961507 is an equidigital number, since it uses as much as digits as its factorization.

628961507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 628961507 is about 25079.1049880174. The cubic root of 628961507 is about 856.7905918888.

The spelling of 628961507 in words is "six hundred twenty-eight million, nine hundred sixty-one thousand, five hundred seven".