87142638 has 16 divisors (see below), whose sum is σ = 190129536. Its totient is φ = 26406840.

The previous prime is 87142637. The next prime is 87142669. The reversal of 87142638 is 83624178.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87142596 and 87142605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87142633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660106 + ... + 660237.

It is an arithmetic number, because the mean of its divisors is an integer number (11883096).

Almost surely, 2^87142638 is an apocalyptic number.

87142638 is an abundant number, since it is smaller than the sum of its proper divisors (102986898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87142638 is a wasteful number, since it uses less digits than its factorization.

87142638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320359.

The product of its digits is 64512, while the sum is 39.

The square root of 87142638 is about 9335.0221210236. The cubic root of 87142638 is about 443.3467892474.

The spelling of 87142638 in words is "eighty-seven million, one hundred forty-two thousand, six hundred thirty-eight".