81007824 has 40 divisors (see below), whose sum is σ = 212402080. Its totient is φ = 26598528.

The previous prime is 81007807. The next prime is 81007831. The reversal of 81007824 is 42870018.

It is a junction number, because it is equal to n+sod(n) for n = 81007791 and 81007800.

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, 9379 + ... + 15810.

It is an arithmetic number, because the mean of its divisors is an integer number (5310052).

Almost surely, 2^81007824 is an apocalyptic number.

It is an amenable number.

81007824 is an abundant number, since it is smaller than the sum of its proper divisors (131394256).

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

81007824 is a wasteful number, since it uses less digits than its factorization.

81007824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25267 (or 25261 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81007824 is about 9000.4346561708. The cubic root of 81007824 is about 432.6888017062.

The spelling of 81007824 in words is "eighty-one million, seven thousand, eight hundred twenty-four".