87505487 has 4 divisors (see below), whose sum is σ = 87525240. Its totient is φ = 87485736.

The previous prime is 87505463. The next prime is 87505513. The reversal of 87505487 is 78450578.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78450578 = 2 ⋅39225289.

It is a cyclic number.

It is not a de Polignac number, because 87505487 - 2¹² = 87501391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87505447) 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, 188 + ... + 13230.

It is an arithmetic number, because the mean of its divisors is an integer number (21881310).

Almost surely, 2^87505487 is an apocalyptic number.

87505487 is a deficient number, since it is larger than the sum of its proper divisors (19753).

87505487 is a wasteful number, since it uses less digits than its factorization.

87505487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19752.

The product of its (nonzero) digits is 313600, while the sum is 44.

The square root of 87505487 is about 9354.4367548239. The cubic root of 87505487 is about 443.9612805426.

The spelling of 87505487 in words is "eighty-seven million, five hundred five thousand, four hundred eighty-seven".