628231690 has 16 divisors (see below), whose sum is σ = 1134435528. Its totient is φ = 250488576.

The previous prime is 628231627. The next prime is 628231697. The reversal of 628231690 is 96132826.

It can be written as a sum of positive squares in 4 ways, for example, as 518882841 + 109348849 = 22779^2 + 10457^2 .

It is a super-2 number, since 2×628231690² = 789350112640512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628231697) 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, 97227 + ... + 103486.

Almost surely, 2^628231690 is an apocalyptic number.

628231690 is a deficient number, since it is larger than the sum of its proper divisors (506203838).

628231690 is a wasteful number, since it uses less digits than its factorization.

628231690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201033.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 628231690 is about 25064.5504647500. The cubic root of 628231690 is about 856.4590706193.

The spelling of 628231690 in words is "six hundred twenty-eight million, two hundred thirty-one thousand, six hundred ninety".