628861187965 has 8 divisors (see below), whose sum is σ = 754646621400. Its totient is φ = 503080153152.

The previous prime is 628861187939. The next prime is 628861187971. The reversal of 628861187965 is 569781168826.

It can be written as a sum of positive squares in 4 ways, for example, as 142904412729 + 485956775236 = 378027^2 + 697106^2 .

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 628861187965 - 2⁷ = 628861187837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628861187965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776490 + ... + 1364059.

It is an arithmetic number, because the mean of its divisors is an integer number (94330827675).

Almost surely, 2^628861187965 is an apocalyptic number.

It is an amenable number.

628861187965 is a deficient number, since it is larger than the sum of its proper divisors (125785433435).

628861187965 is a wasteful number, since it uses less digits than its factorization.

628861187965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199311.

The product of its digits is 69672960, while the sum is 67.

The spelling of 628861187965 in words is "six hundred twenty-eight billion, eight hundred sixty-one million, one hundred eighty-seven thousand, nine hundred sixty-five".