87158938 has 4 divisors (see below), whose sum is σ = 130738410. Its totient is φ = 43579468.

The previous prime is 87158933. The next prime is 87158941. The reversal of 87158938 is 83985178.

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., 86062729 + 1096209 = 9277^2 + 1047^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 87158891 and 87158900.

It is not an unprimeable number, because it can be changed into a prime (87158933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21789733 + ... + 21789736.

Almost surely, 2^87158938 is an apocalyptic number.

87158938 is a deficient number, since it is larger than the sum of its proper divisors (43579472).

87158938 is a wasteful number, since it uses less digits than its factorization.

87158938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43579471.

The product of its digits is 483840, while the sum is 49.

The square root of 87158938 is about 9335.8951365148. The cubic root of 87158938 is about 443.3744301448.

The spelling of 87158938 in words is "eighty-seven million, one hundred fifty-eight thousand, nine hundred thirty-eight".