87144494 has 4 divisors (see below), whose sum is σ = 130716744. Its totient is φ = 43572246.

The previous prime is 87144481. The next prime is 87144511. The reversal of 87144494 is 49444178.

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

It is a congruent number.

It is an unprimeable number.

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, 21786122 + ... + 21786125.

It is an arithmetic number, because the mean of its divisors is an integer number (32679186).

Almost surely, 2^87144494 is an apocalyptic number.

87144494 is a deficient number, since it is larger than the sum of its proper divisors (43572250).

87144494 is a wasteful number, since it uses less digits than its factorization.

87144494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43572249.

The product of its digits is 129024, while the sum is 41.

The square root of 87144494 is about 9335.1215310782. The cubic root of 87144494 is about 443.3499367529.

The spelling of 87144494 in words is "eighty-seven million, one hundred forty-four thousand, four hundred ninety-four".