81487602 has 48 divisors (see below), whose sum is σ = 202962240. Its totient is φ = 23145696.

The previous prime is 81487591. The next prime is 81487621. The reversal of 81487602 is 20678418.

81487602 is a `hidden beast` number, since 8 + 1 + 48 + 7 + 602 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20748 + ... + 24360.

It is an arithmetic number, because the mean of its divisors is an integer number (4228380).

Almost surely, 2^81487602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81487602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101481120).

81487602 is an abundant number, since it is smaller than the sum of its proper divisors (121474638).

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

81487602 is a wasteful number, since it uses less digits than its factorization.

81487602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807 (or 3804 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81487602 is about 9027.0483548057. The cubic root of 81487602 is about 433.5413369584.

The spelling of 81487602 in words is "eighty-one million, four hundred eighty-seven thousand, six hundred two".