628321320 has 128 divisors (see below), whose sum is σ = 2284848000. Its totient is φ = 152317440.

The previous prime is 628321313. The next prime is 628321327. The reversal of 628321320 is 23123826.

628321320 is a `hidden beast` number, since 628 + 3 + 2 + 1 + 32 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (628321313) and next prime (628321327).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (628321327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14565 + ... + 38324.

It is an arithmetic number, because the mean of its divisors is an integer number (17850375).

Almost surely, 2^628321320 is an apocalyptic number.

628321320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

628321320 is an abundant number, since it is smaller than the sum of its proper divisors (1656526680).

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

628321320 is a wasteful number, since it uses less digits than its factorization.

628321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52920 (or 52910 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 628321320 is about 25066.3383843752. The cubic root of 628321320 is about 856.4997991050.

The spelling of 628321320 in words is "six hundred twenty-eight million, three hundred twenty-one thousand, three hundred twenty".