628891131 has 16 divisors (see below), whose sum is σ = 927285120. Its totient is φ = 375923520.

The previous prime is 628891121. The next prime is 628891147. The reversal of 628891131 is 131198826.

It is not a de Polignac number, because 628891131 - 2⁵ = 628891099 is a prime.

It is a super-2 number, since 2×628891131² = 791008109300918322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 628891131.

It is not an unprimeable number, because it can be changed into a prime (628891111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128121 + ... + 132938.

It is an arithmetic number, because the mean of its divisors is an integer number (57955320).

Almost surely, 2^628891131 is an apocalyptic number.

628891131 is a deficient number, since it is larger than the sum of its proper divisors (298393989).

628891131 is a wasteful number, since it uses less digits than its factorization.

628891131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261146.

The product of its digits is 20736, while the sum is 39.

The square root of 628891131 is about 25077.7018683930. The cubic root of 628891131 is about 856.7586345839.

The spelling of 628891131 in words is "six hundred twenty-eight million, eight hundred ninety-one thousand, one hundred thirty-one".