561628887 has 8 divisors (see below), whose sum is σ = 748948080. Its totient is φ = 374364480.

The previous prime is 561628867. The next prime is 561628913. The reversal of 561628887 is 788826165.

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

It is not a de Polignac number, because 561628887 - 2²⁶ = 494520023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561628807) 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 7 ways as a sum of consecutive naturals, for example, 32187 + ... + 46467.

It is an arithmetic number, because the mean of its divisors is an integer number (93618510).

Almost surely, 2^561628887 is an apocalyptic number.

561628887 is a deficient number, since it is larger than the sum of its proper divisors (187319193).

561628887 is a wasteful number, since it uses less digits than its factorization.

561628887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27393.

The product of its digits is 1290240, while the sum is 51.

The square root of 561628887 is about 23698.7106611309. The cubic root of 561628887 is about 825.0554658760.

The spelling of 561628887 in words is "five hundred sixty-one million, six hundred twenty-eight thousand, eight hundred eighty-seven".