628970401 has 2 divisors, whose sum is σ = 628970402. Its totient is φ = 628970400.

The previous prime is 628970399. The next prime is 628970423. The reversal of 628970401 is 104079826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625050001 + 3920400 = 25001^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 628970401 - 2¹ = 628970399 is a prime.

Together with 628970399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (628970101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314485200 + 314485201.

It is an arithmetic number, because the mean of its divisors is an integer number (314485201).

Almost surely, 2^628970401 is an apocalyptic number.

It is an amenable number.

628970401 is a deficient number, since it is larger than the sum of its proper divisors (1).

628970401 is an equidigital number, since it uses as much as digits as its factorization.

628970401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 628970401 is about 25079.2823063181. The cubic root of 628970401 is about 856.7946304293.

The spelling of 628970401 in words is "six hundred twenty-eight million, nine hundred seventy thousand, four hundred one".