628444645 has 16 divisors (see below), whose sum is σ = 781724160. Its totient is φ = 484432704.

The previous prime is 628444603. The next prime is 628444681. The reversal of 628444645 is 546444826.

It is not a de Polignac number, because 628444645 - 2¹⁵ = 628411877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71692 + ... + 79978.

It is an arithmetic number, because the mean of its divisors is an integer number (48857760).

Almost surely, 2^628444645 is an apocalyptic number.

It is an amenable number.

628444645 is a deficient number, since it is larger than the sum of its proper divisors (153279515).

628444645 is a wasteful number, since it uses less digits than its factorization.

628444645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844.

The product of its digits is 737280, while the sum is 43.

The square root of 628444645 is about 25068.7982360543. The cubic root of 628444645 is about 856.5558324987. Note that the first 3 decimals are identical.

The spelling of 628444645 in words is "six hundred twenty-eight million, four hundred forty-four thousand, six hundred forty-five".