628820631 has 16 divisors (see below), whose sum is σ = 937171200. Its totient is φ = 416700504.

The previous prime is 628820629. The next prime is 628820641. The reversal of 628820631 is 136028826.

628820631 is a `hidden beast` number, since 628 + 8 + 20 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 628820631 - 2¹ = 628820629 is a prime.

It is a super-2 number, since 2×628820631² = 790830771942476322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628820641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65221 + ... + 74238.

It is an arithmetic number, because the mean of its divisors is an integer number (58573200).

Almost surely, 2^628820631 is an apocalyptic number.

628820631 is a deficient number, since it is larger than the sum of its proper divisors (308350569).

628820631 is a wasteful number, since it uses less digits than its factorization.

628820631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139635 (or 139629 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 628820631 is about 25076.2961978040. The cubic root of 628820631 is about 856.7266185810.

The spelling of 628820631 in words is "six hundred twenty-eight million, eight hundred twenty thousand, six hundred thirty-one".