87761539 has 4 divisors (see below), whose sum is σ = 88216456. Its totient is φ = 87306624.

The previous prime is 87761533. The next prime is 87761543. The reversal of 87761539 is 93516778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93516778 = 2 ⋅46758389.

It is a cyclic number.

It is not a de Polignac number, because 87761539 - 2²¹ = 85664387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87761533) 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, 227169 + ... + 227554.

It is an arithmetic number, because the mean of its divisors is an integer number (22054114).

Almost surely, 2^87761539 is an apocalyptic number.

87761539 is a deficient number, since it is larger than the sum of its proper divisors (454917).

87761539 is a wasteful number, since it uses less digits than its factorization.

87761539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454916.

The product of its digits is 317520, while the sum is 46.

The square root of 87761539 is about 9368.1128836068. The cubic root of 87761539 is about 444.3938876080.

The spelling of 87761539 in words is "eighty-seven million, seven hundred sixty-one thousand, five hundred thirty-nine".