628534631 has 4 divisors (see below), whose sum is σ = 632697264. Its totient is φ = 624372000.

The previous prime is 628534609. The next prime is 628534663. The reversal of 628534631 is 136435826.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628534631 is a prime.

It is a super-2 number, since 2×628534631² = 790111564732612322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628530631) 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, 2081090 + ... + 2081391.

It is an arithmetic number, because the mean of its divisors is an integer number (158174316).

Almost surely, 2^628534631 is an apocalyptic number.

628534631 is a deficient number, since it is larger than the sum of its proper divisors (4162633).

628534631 is a wasteful number, since it uses less digits than its factorization.

628534631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162632.

The product of its digits is 103680, while the sum is 38.

The square root of 628534631 is about 25070.5929527006. The cubic root of 628534631 is about 856.5967135082.

The spelling of 628534631 in words is "six hundred twenty-eight million, five hundred thirty-four thousand, six hundred thirty-one".