81450360 has 160 divisors (see below), whose sum is σ = 285927840. Its totient is φ = 20756736.

The previous prime is 81450353. The next prime is 81450367. The reversal of 81450360 is 6305418.

It is an interprime number because it is at equal distance from previous prime (81450353) and next prime (81450367).

It is a super-2 number, since 2×81450360² = 13268322288259200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81450367) 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, 73974 + ... + 75066.

It is an arithmetic number, because the mean of its divisors is an integer number (1787049).

Almost surely, 2^81450360 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 81450360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142963920).

81450360 is an abundant number, since it is smaller than the sum of its proper divisors (204477480).

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

81450360 is a wasteful number, since it uses less digits than its factorization.

81450360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 81450360 is about 9024.9853185476. The cubic root of 81450360 is about 433.4752802561.

Adding to 81450360 its reverse (6305418), we get a palindrome (87755778).

It can be divided in two parts, 81450 and 360, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 81450360 in words is "eighty-one million, four hundred fifty thousand, three hundred sixty".