628440396 has 24 divisors (see below), whose sum is σ = 1466868480. Its totient is φ = 209407632.

The previous prime is 628440391. The next prime is 628440419. The reversal of 628440396 is 693044826.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (628440391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36025 + ... + 50543.

It is an arithmetic number, because the mean of its divisors is an integer number (61119520).

Almost surely, 2^628440396 is an apocalyptic number.

It is an amenable number.

628440396 is an abundant number, since it is smaller than the sum of its proper divisors (838428084).

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

628440396 is a wasteful number, since it uses less digits than its factorization.

628440396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18133 (or 18131 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 628440396 is about 25068.7134891282. The cubic root of 628440396 is about 856.5539020640.

The spelling of 628440396 in words is "six hundred twenty-eight million, four hundred forty thousand, three hundred ninety-six".