628445471 has 4 divisors (see below), whose sum is σ = 629244792. Its totient is φ = 627646152.

The previous prime is 628445437. The next prime is 628445479. The reversal of 628445471 is 174544826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628445471 is a prime.

It is a super-3 number, since 3×628445471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628445479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398480 + ... + 400053.

It is an arithmetic number, because the mean of its divisors is an integer number (157311198).

Almost surely, 2^628445471 is an apocalyptic number.

628445471 is a deficient number, since it is larger than the sum of its proper divisors (799321).

628445471 is an equidigital number, since it uses as much as digits as its factorization.

628445471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799320.

The product of its digits is 215040, while the sum is 41.

The square root of 628445471 is about 25068.8147107118. The cubic root of 628445471 is about 856.5562077716.

The spelling of 628445471 in words is "six hundred twenty-eight million, four hundred forty-five thousand, four hundred seventy-one".