81588650 has 48 divisors (see below), whose sum is σ = 178301088. Its totient is φ = 27384000.

The previous prime is 81588643. The next prime is 81588653. The reversal of 81588650 is 5688518.

It is a junction number, because it is equal to n+sod(n) for n = 81588598 and 81588607.

It is not an unprimeable number, because it can be changed into a prime (81588653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1445 + ... + 12855.

It is an arithmetic number, because the mean of its divisors is an integer number (3714606).

Almost surely, 2^81588650 is an apocalyptic number.

81588650 is an abundant number, since it is smaller than the sum of its proper divisors (96712438).

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

81588650 is a wasteful number, since it uses less digits than its factorization.

81588650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11447 (or 11442 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 41.

The square root of 81588650 is about 9032.6435776023. The cubic root of 81588650 is about 433.7204660050.

The spelling of 81588650 in words is "eighty-one million, five hundred eighty-eight thousand, six hundred fifty".