87759561 has 4 divisors (see below), whose sum is σ = 117012752. Its totient is φ = 58506372.

The previous prime is 87759547. The next prime is 87759563. The reversal of 87759561 is 16595778.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87759561 - 2⁷ = 87759433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87759561.

It is not an unprimeable number, because it can be changed into a prime (87759563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14626591 + ... + 14626596.

It is an arithmetic number, because the mean of its divisors is an integer number (29253188).

Almost surely, 2^87759561 is an apocalyptic number.

It is an amenable number.

87759561 is a deficient number, since it is larger than the sum of its proper divisors (29253191).

87759561 is a wasteful number, since it uses less digits than its factorization.

87759561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29253190.

The product of its digits is 529200, while the sum is 48.

The square root of 87759561 is about 9368.0073121235. The cubic root of 87759561 is about 444.3905489484.

It can be divided in two parts, 8775 and 9561, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 87759561 in words is "eighty-seven million, seven hundred fifty-nine thousand, five hundred sixty-one".