81410427 has 40 divisors (see below), whose sum is σ = 141126656. Its totient is φ = 45804528.

The previous prime is 81410423. The next prime is 81410431. The reversal of 81410427 is 72401418.

It is an interprime number because it is at equal distance from previous prime (81410423) and next prime (81410431).

It is not a de Polignac number, because 81410427 - 2² = 81410423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81410427.

It is not an unprimeable number, because it can be changed into a prime (81410423) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36918 + ... + 39060.

Almost surely, 2^81410427 is an apocalyptic number.

81410427 is a deficient number, since it is larger than the sum of its proper divisors (59716229).

81410427 is a wasteful number, since it uses less digits than its factorization.

81410427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 81410427 is about 9022.7726891461. The cubic root of 81410427 is about 433.4044281117.

Subtracting from 81410427 its reverse (72401418), we obtain a palindrome (9009009).

The spelling of 81410427 in words is "eighty-one million, four hundred ten thousand, four hundred twenty-seven".