81023460 has 192 divisors, whose sum is σ = 275251200. Its totient is φ = 17781120.

The previous prime is 81023431. The next prime is 81023473. The reversal of 81023460 is 6432018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81023460.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 637917 + ... + 638043.

It is an arithmetic number, because the mean of its divisors is an integer number (1433600).

Almost surely, 2^81023460 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 81023460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137625600).

81023460 is an abundant number, since it is smaller than the sum of its proper divisors (194227740).

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

81023460 is a wasteful number, since it uses less digits than its factorization.

81023460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81023460 is about 9001.3032389760. The cubic root of 81023460 is about 432.7166388810.

Adding to 81023460 its reverse (6432018), we get a palindrome (87455478).

The spelling of 81023460 in words is "eighty-one million, twenty-three thousand, four hundred sixty".