81502416 has 80 divisors (see below), whose sum is σ = 240312000. Its totient is φ = 26428032.

The previous prime is 81502387. The next prime is 81502417. The reversal of 81502416 is 61420518.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81502416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81502417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13435 + ... + 18533.

It is an arithmetic number, because the mean of its divisors is an integer number (3003900).

Almost surely, 2^81502416 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 81502416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120156000).

81502416 is an abundant number, since it is smaller than the sum of its proper divisors (158809584).

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

81502416 is a wasteful number, since it uses less digits than its factorization.

81502416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153 (or 5141 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81502416 is about 9027.8688515064. The cubic root of 81502416 is about 433.5676071806.

It can be divided in two parts, 81502 and 416, that added together give a palindrome (81918).

The spelling of 81502416 in words is "eighty-one million, five hundred two thousand, four hundred sixteen".