87139525 has 36 divisors (see below), whose sum is σ = 123429600. Its totient is φ = 60517600.

The previous prime is 87139523. The next prime is 87139531. The reversal of 87139525 is 52593178.

87139525 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 87139525 - 2¹ = 87139523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87139523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 145176 + ... + 145774.

It is an arithmetic number, because the mean of its divisors is an integer number (3428600).

Almost surely, 2^87139525 is an apocalyptic number.

It is an amenable number.

87139525 is a deficient number, since it is larger than the sum of its proper divisors (36290075).

87139525 is a wasteful number, since it uses less digits than its factorization.

87139525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 638 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The square root of 87139525 is about 9334.8553818471. The cubic root of 87139525 is about 443.3415099528.

The spelling of 87139525 in words is "eighty-seven million, one hundred thirty-nine thousand, five hundred twenty-five".