628772991 has 24 divisors (see below), whose sum is σ = 1053155712. Its totient is φ = 326634000.

The previous prime is 628772959. The next prime is 628772993. The reversal of 628772991 is 199277826.

It is not a de Polignac number, because 628772991 - 2⁵ = 628772959 is a prime.

It is a super-2 number, since 2×628772991² = 790710948422172162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628772993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121185 + ... + 126266.

It is an arithmetic number, because the mean of its divisors is an integer number (43881488).

Almost surely, 2^628772991 is an apocalyptic number.

628772991 is a deficient number, since it is larger than the sum of its proper divisors (424382721).

628772991 is a wasteful number, since it uses less digits than its factorization.

628772991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247483 (or 247472 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 628772991 is about 25075.3462787655. The cubic root of 628772991 is about 856.7049825824.

The spelling of 628772991 in words is "six hundred twenty-eight million, seven hundred seventy-two thousand, nine hundred ninety-one".