616561887 has 8 divisors (see below), whose sum is σ = 823844736. Its totient is φ = 410160152.

The previous prime is 616561877. The next prime is 616561901. The reversal of 616561887 is 788165616.

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 616561887 - 2¹⁶ = 616496351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616561817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218643 + ... + 221444.

It is an arithmetic number, because the mean of its divisors is an integer number (102980592).

Almost surely, 2^616561887 is an apocalyptic number.

616561887 is a deficient number, since it is larger than the sum of its proper divisors (207282849).

616561887 is a wasteful number, since it uses less digits than its factorization.

616561887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440557.

The product of its digits is 483840, while the sum is 48.

The square root of 616561887 is about 24830.6642480623. The cubic root of 616561887 is about 851.1228008517.

The spelling of 616561887 in words is "six hundred sixteen million, five hundred sixty-one thousand, eight hundred eighty-seven".