628806293 has 4 divisors (see below), whose sum is σ = 629299980. Its totient is φ = 628312608.

The previous prime is 628806259. The next prime is 628806307. The reversal of 628806293 is 392608826.

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

It can be written as a sum of positive squares in 2 ways, for example, as 260435044 + 368371249 = 16138^2 + 19193^2 .

It is a cyclic number.

It is not a de Polignac number, because 628806293 - 2¹² = 628802197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628806253) 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, 244928 + ... + 247481.

It is an arithmetic number, because the mean of its divisors is an integer number (157324995).

Almost surely, 2^628806293 is an apocalyptic number.

It is an amenable number.

628806293 is a deficient number, since it is larger than the sum of its proper divisors (493687).

628806293 is a wasteful number, since it uses less digits than its factorization.

628806293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493686.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 628806293 is about 25076.0103086595. The cubic root of 628806293 is about 856.7201070052.

The spelling of 628806293 in words is "six hundred twenty-eight million, eight hundred six thousand, two hundred ninety-three".