628227720 has 48 divisors (see below), whose sum is σ = 2041741260. Its totient is φ = 167527296.

The previous prime is 628227701. The next prime is 628227737. The reversal of 628227720 is 27722826.

628227720 is a `hidden beast` number, since 628 + 2 + 2 + 7 + 7 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 567106596 + 61121124 = 23814^2 + 7818^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 872179 + ... + 872898.

Almost surely, 2^628227720 is an apocalyptic number.

628227720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

628227720 is an abundant number, since it is smaller than the sum of its proper divisors (1413513540).

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

628227720 is a wasteful number, since it uses less digits than its factorization.

628227720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745094 (or 1745087 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 628227720 is about 25064.4712691092. The cubic root of 628227720 is about 856.4572665345.

The spelling of 628227720 in words is "six hundred twenty-eight million, two hundred twenty-seven thousand, seven hundred twenty".