628628891581 has 8 divisors (see below), whose sum is σ = 666452828160. Its totient is φ = 590898929088.

The previous prime is 628628891573. The next prime is 628628891593. The reversal of 628628891581 is 185198826826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628628891581 - 2³ = 628628891573 is a prime.

It is a super-2 number, since 2×628628891581² (a number of 24 digits) 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 (628628892581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23479741 + ... + 23506498.

It is an arithmetic number, because the mean of its divisors is an integer number (83306603520).

Almost surely, 2^628628891581 is an apocalyptic number.

It is an amenable number.

628628891581 is a deficient number, since it is larger than the sum of its proper divisors (37823936579).

628628891581 is a wasteful number, since it uses less digits than its factorization.

628628891581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46987043.

The product of its digits is 26542080, while the sum is 64.

The spelling of 628628891581 in words is "six hundred twenty-eight billion, six hundred twenty-eight million, eight hundred ninety-one thousand, five hundred eighty-one".