81263460 has 24 divisors (see below), whose sum is σ = 227537856. Its totient is φ = 21670240.

The previous prime is 81263449. The next prime is 81263461. The reversal of 81263460 is 6436218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81263461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677136 + ... + 677255.

It is an arithmetic number, because the mean of its divisors is an integer number (9480744).

Almost surely, 2^81263460 is an apocalyptic number.

It is an amenable number.

81263460 is an abundant number, since it is smaller than the sum of its proper divisors (146274396).

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

81263460 is a wasteful number, since it uses less digits than its factorization.

81263460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354403 (or 1354401 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81263460 is about 9014.6247842048. The cubic root of 81263460 is about 433.1434684337.

Adding to 81263460 its reverse (6436218), we get a palindrome (87699678).

The spelling of 81263460 in words is "eighty-one million, two hundred sixty-three thousand, four hundred sixty".