81214460 has 24 divisors (see below), whose sum is σ = 170758896. Its totient is φ = 32446080.

The previous prime is 81214459. The next prime is 81214517. The reversal of 81214460 is 6441218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18695 + ... + 22625.

It is an arithmetic number, because the mean of its divisors is an integer number (7114954).

Almost surely, 2^81214460 is an apocalyptic number.

It is an amenable number.

81214460 is an abundant number, since it is smaller than the sum of its proper divisors (89544436).

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

81214460 is a wasteful number, since it uses less digits than its factorization.

81214460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973 (or 4971 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81214460 is about 9011.9065685348. The cubic root of 81214460 is about 433.0563924086.

Adding to 81214460 its reverse (6441218), we get a palindrome (87655678).

The spelling of 81214460 in words is "eighty-one million, two hundred fourteen thousand, four hundred sixty".