81414140 has 24 divisors (see below), whose sum is σ = 171243072. Its totient is φ = 32513600.

The previous prime is 81414133. The next prime is 81414149. The reversal of 81414140 is 4141418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81414149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11117 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (7135128).

Almost surely, 2^81414140 is an apocalyptic number.

It is an amenable number.

81414140 is an abundant number, since it is smaller than the sum of its proper divisors (89828932).

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

81414140 is a wasteful number, since it uses less digits than its factorization.

81414140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6517 (or 6515 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 81414140 is about 9022.9784439508. The cubic root of 81414140 is about 433.4110169735.

Adding to 81414140 its reverse (4141418), we get a palindrome (85555558).

The spelling of 81414140 in words is "eighty-one million, four hundred fourteen thousand, one hundred forty".