7887561 has 8 divisors (see below), whose sum is σ = 11472864. Its totient is φ = 4780320.

The previous prime is 7887559. The next prime is 7887599. The reversal of 7887561 is 1657887.

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

It is not a de Polignac number, because 7887561 - 2¹ = 7887559 is a prime.

7887561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7887511) 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, 119476 + ... + 119541.

It is an arithmetic number, because the mean of its divisors is an integer number (1434108).

Almost surely, 2^7887561 is an apocalyptic number.

It is an amenable number.

7887561 is a deficient number, since it is larger than the sum of its proper divisors (3585303).

7887561 is a wasteful number, since it uses less digits than its factorization.

7887561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239031.

The product of its digits is 94080, while the sum is 42.

The square root of 7887561 is about 2808.4801939839. The cubic root of 7887561 is about 199.0585839654.

It can be divided in two parts, 7887 and 561, that added together give a palindrome (8448).

The spelling of 7887561 in words is "seven million, eight hundred eighty-seven thousand, five hundred sixty-one".