628407506 has 8 divisors (see below), whose sum is σ = 955523964. Its totient is φ = 309899520.

The previous prime is 628407503. The next prime is 628407509. The reversal of 628407506 is 605704826.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (628407503) and next prime (628407509).

It can be written as a sum of positive squares in 2 ways, for example, as 627753025 + 654481 = 25055^2 + 809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 628407506.

It is not an unprimeable number, because it can be changed into a prime (628407503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151935 + ... + 2152226.

Almost surely, 2^628407506 is an apocalyptic number.

628407506 is a deficient number, since it is larger than the sum of its proper divisors (327116458).

628407506 is a wasteful number, since it uses less digits than its factorization.

628407506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304236.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 628407506 is about 25068.0574835786. The cubic root of 628407506 is about 856.5389589607.

The spelling of 628407506 in words is "six hundred twenty-eight million, four hundred seven thousand, five hundred six".