87481643 has 8 divisors (see below), whose sum is σ = 97503120. Its totient is φ = 78001920.

The previous prime is 87481633. The next prime is 87481657. The reversal of 87481643 is 34618478.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87481643 - 2¹⁸ = 87219499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87481643.

It is not an unprimeable number, because it can be changed into a prime (87481633) 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, 135098 + ... + 135743.

It is an arithmetic number, because the mean of its divisors is an integer number (12187890).

Almost surely, 2^87481643 is an apocalyptic number.

87481643 is a deficient number, since it is larger than the sum of its proper divisors (10021477).

87481643 is a wasteful number, since it uses less digits than its factorization.

87481643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270877.

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

The square root of 87481643 is about 9353.1621925422. The cubic root of 87481643 is about 443.9209525023.

The spelling of 87481643 in words is "eighty-seven million, four hundred eighty-one thousand, six hundred forty-three".