81487824 has 40 divisors (see below), whose sum is σ = 229648992. Its totient is φ = 24693120.

The previous prime is 81487811. The next prime is 81487831. The reversal of 81487824 is 42878418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76639 + ... + 77694.

Almost surely, 2^81487824 is an apocalyptic number.

It is an amenable number.

81487824 is an abundant number, since it is smaller than the sum of its proper divisors (148161168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81487824 is a wasteful number, since it uses less digits than its factorization.

81487824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154355 (or 154349 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 81487824 is about 9027.0606511754. The cubic root of 81487824 is about 433.5417306629.

The spelling of 81487824 in words is "eighty-one million, four hundred eighty-seven thousand, eight hundred twenty-four".