81219348 has 168 divisors, whose sum is σ = 255604608. Its totient is φ = 22068288.

The previous prime is 81219331. The next prime is 81219367. The reversal of 81219348 is 84391218.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 469390 + ... + 469562.

It is an arithmetic number, because the mean of its divisors is an integer number (1521456).

Almost surely, 2^81219348 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 81219348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127802304).

81219348 is an abundant number, since it is smaller than the sum of its proper divisors (174385260).

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

81219348 is a wasteful number, since it uses less digits than its factorization.

81219348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 208 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 81219348 is about 9012.1777612295. The cubic root of 81219348 is about 433.0650802587.

The spelling of 81219348 in words is "eighty-one million, two hundred nineteen thousand, three hundred forty-eight".