81652536 has 160 divisors (see below), whose sum is σ = 267632640. Its totient is φ = 22773312.

The previous prime is 81652531. The next prime is 81652537. The reversal of 81652536 is 63525618.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81652536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81652531) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 213001 + ... + 213383.

It is an arithmetic number, because the mean of its divisors is an integer number (1672704).

Almost surely, 2^81652536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81652536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133816320).

81652536 is an abundant number, since it is smaller than the sum of its proper divisors (185980104).

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

81652536 is a wasteful number, since it uses less digits than its factorization.

81652536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 442 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 81652536 is about 9036.1792810900. The cubic root of 81652536 is about 433.8336412103.

It can be divided in two parts, 8165 and 2536, that added together give a palindrome (10701).

The spelling of 81652536 in words is "eighty-one million, six hundred fifty-two thousand, five hundred thirty-six".