628906281 has 8 divisors (see below), whose sum is σ = 849156480. Its totient is φ = 413963472.

The previous prime is 628906277. The next prime is 628906301. The reversal of 628906281 is 182609826.

628906281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628906281 - 2² = 628906277 is a prime.

It is a super-2 number, since 2×628906281² = 791046220562501922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628906231) 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, 1326570 + ... + 1327043.

It is an arithmetic number, because the mean of its divisors is an integer number (106144560).

Almost surely, 2^628906281 is an apocalyptic number.

It is an amenable number.

628906281 is a deficient number, since it is larger than the sum of its proper divisors (220250199).

628906281 is a wasteful number, since it uses less digits than its factorization.

628906281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653695.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 628906281 is about 25078.0039277451. The cubic root of 628906281 is about 856.7655143063.

The spelling of 628906281 in words is "six hundred twenty-eight million, nine hundred six thousand, two hundred eighty-one".