87131446 has 4 divisors (see below), whose sum is σ = 130697172. Its totient is φ = 43565722.

The previous prime is 87131441. The next prime is 87131449. The reversal of 87131446 is 64413178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64413178 = 2 ⋅32206589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87131441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21782860 + ... + 21782863.

It is an arithmetic number, because the mean of its divisors is an integer number (32674293).

Almost surely, 2^87131446 is an apocalyptic number.

87131446 is a deficient number, since it is larger than the sum of its proper divisors (43565726).

87131446 is a wasteful number, since it uses less digits than its factorization.

87131446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43565725.

The product of its digits is 16128, while the sum is 34.

The square root of 87131446 is about 9334.4226388138. The cubic root of 87131446 is about 443.3278082992.

The spelling of 87131446 in words is "eighty-seven million, one hundred thirty-one thousand, four hundred forty-six".