628433220 has 48 divisors (see below), whose sum is σ = 1863122688. Its totient is φ = 157724160.

The previous prime is 628433213. The next prime is 628433231. The reversal of 628433220 is 22334826.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307036 + ... + 309075.

It is an arithmetic number, because the mean of its divisors is an integer number (38815056).

Almost surely, 2^628433220 is an apocalyptic number.

628433220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

628433220 is an abundant number, since it is smaller than the sum of its proper divisors (1234689468).

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

628433220 is a wasteful number, since it uses less digits than its factorization.

628433220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616140 (or 616138 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 628433220 is about 25068.5703621088. The cubic root of 628433220 is about 856.5506417951.

The spelling of 628433220 in words is "six hundred twenty-eight million, four hundred thirty-three thousand, two hundred twenty".