628636301991 has 12 divisors (see below), whose sum is σ = 921582904632. Its totient is φ = 412835780016.

The previous prime is 628636301959. The next prime is 628636302023. The reversal of 628636301991 is 199103636826.

628636301991 is a `hidden beast` number, since 628 + 6 + 3 + 6 + 3 + 0 + 1 + 9 + 9 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (628636301959) and next prime (628636302023).

It is not a de Polignac number, because 628636301991 - 2⁵ = 628636301959 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628636301791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 521256696 + ... + 521257901.

It is an arithmetic number, because the mean of its divisors is an integer number (76798575386).

Almost surely, 2^628636301991 is an apocalyptic number.

628636301991 is a deficient number, since it is larger than the sum of its proper divisors (292946602641).

628636301991 is a wasteful number, since it uses less digits than its factorization.

628636301991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042514670 (or 1042514667 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 628636301991 in words is "six hundred twenty-eight billion, six hundred thirty-six million, three hundred one thousand, nine hundred ninety-one".