87013642 has 4 divisors (see below), whose sum is σ = 130520466. Its totient is φ = 43506820.

The previous prime is 87013607. The next prime is 87013643. The reversal of 87013642 is 24631078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81162081 + 5851561 = 9009^2 + 2419^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (87013643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21753409 + ... + 21753412.

Almost surely, 2^87013642 is an apocalyptic number.

87013642 is a deficient number, since it is larger than the sum of its proper divisors (43506824).

87013642 is a wasteful number, since it uses less digits than its factorization.

87013642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43506823.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 87013642 is about 9328.1103123837. The cubic root of 87013642 is about 443.1279212469.

The spelling of 87013642 in words is "eighty-seven million, thirteen thousand, six hundred forty-two".