628028705 has 8 divisors (see below), whose sum is σ = 797965992. Its totient is φ = 472868608.

The previous prime is 628028701. The next prime is 628028719. The reversal of 628028705 is 507820826.

It can be written as a sum of positive squares in 4 ways, for example, as 49674304 + 578354401 = 7048^2 + 24049^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 628028705 - 2² = 628028701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628028701) 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, 3694202 + ... + 3694371.

It is an arithmetic number, because the mean of its divisors is an integer number (99745749).

Almost surely, 2^628028705 is an apocalyptic number.

It is an amenable number.

628028705 is a deficient number, since it is larger than the sum of its proper divisors (169937287).

628028705 is a wasteful number, since it uses less digits than its factorization.

628028705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7388595.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 628028705 is about 25060.5008928393. The cubic root of 628028705 is about 856.3668185228.

The spelling of 628028705 in words is "six hundred twenty-eight million, twenty-eight thousand, seven hundred five".