81503202 has 48 divisors (see below), whose sum is σ = 188944992. Its totient is φ = 23239680.

The previous prime is 81503173. The next prime is 81503209. The reversal of 81503202 is 20230518.

It is not an unprimeable number, because it can be changed into a prime (81503209) 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, 16938 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (3936354).

Almost surely, 2^81503202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81503202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94472496).

81503202 is an abundant number, since it is smaller than the sum of its proper divisors (107441790).

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

81503202 is a wasteful number, since it uses less digits than its factorization.

81503202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 81503202 is about 9027.9123832700. The cubic root of 81503202 is about 433.5690009349.

The spelling of 81503202 in words is "eighty-one million, five hundred three thousand, two hundred two".