87077561 has 4 divisors (see below), whose sum is σ = 88505124. Its totient is φ = 85650000.

The previous prime is 87077531. The next prime is 87077591. The reversal of 87077561 is 16577078.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (87077531) and next prime (87077591).

It can be written as a sum of positive squares in 2 ways, for example, as 3171961 + 83905600 = 1781^2 + 9160^2 .

It is a cyclic number.

It is not a de Polignac number, because 87077561 - 2¹⁰ = 87076537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87077531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713690 + ... + 713811.

It is an arithmetic number, because the mean of its divisors is an integer number (22126281).

Almost surely, 2^87077561 is an apocalyptic number.

It is an amenable number.

87077561 is a deficient number, since it is larger than the sum of its proper divisors (1427563).

87077561 is a wasteful number, since it uses less digits than its factorization.

87077561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427562.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 87077561 is about 9331.5358328627. The cubic root of 87077561 is about 443.2363998725.

The spelling of 87077561 in words is "eighty-seven million, seventy-seven thousand, five hundred sixty-one".