628997706 has 48 divisors (see below), whose sum is σ = 1405060488. Its totient is φ = 203212800.

The previous prime is 628997647. The next prime is 628997723. The reversal of 628997706 is 607799826.

628997706 is a `hidden beast` number, since 628 + 9 + 9 + 7 + 7 + 0 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 627051681 + 1946025 = 25041^2 + 1395^2 .

It is a super-2 number, since 2×628997706² = 791276228306524872, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185466 + ... + 188826.

Almost surely, 2^628997706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 628997706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702530244).

628997706 is an abundant number, since it is smaller than the sum of its proper divisors (776062782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628997706 is a wasteful number, since it uses less digits than its factorization.

628997706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687 (or 3684 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 628997706 is about 25079.8266740422. The cubic root of 628997706 is about 856.8070287016.

The spelling of 628997706 in words is "six hundred twenty-eight million, nine hundred ninety-seven thousand, seven hundred six".