87761537 has 4 divisors (see below), whose sum is σ = 91577280. Its totient is φ = 83945796.

The previous prime is 87761533. The next prime is 87761543. The reversal of 87761537 is 73516778.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73516778 = 2 ⋅36758389.

It is a cyclic number.

It is not a de Polignac number, because 87761537 - 2² = 87761533 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907837 + ... + 1907882.

It is an arithmetic number, because the mean of its divisors is an integer number (22894320).

Almost surely, 2^87761537 is an apocalyptic number.

It is an amenable number.

87761537 is a deficient number, since it is larger than the sum of its proper divisors (3815743).

87761537 is a wasteful number, since it uses less digits than its factorization.

87761537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815742.

The product of its digits is 246960, while the sum is 44.

The square root of 87761537 is about 9368.1127768617. The cubic root of 87761537 is about 444.3938842323.

The spelling of 87761537 in words is "eighty-seven million, seven hundred sixty-one thousand, five hundred thirty-seven".