81416427 has 16 divisors (see below), whose sum is σ = 114423840. Its totient is φ = 51414272.

The previous prime is 81416411. The next prime is 81416429. The reversal of 81416427 is 72461418.

It is a cyclic number.

It is not a de Polignac number, because 81416427 - 2⁴ = 81416411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81416429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4218 + ... + 13439.

It is an arithmetic number, because the mean of its divisors is an integer number (7151490).

Almost surely, 2^81416427 is an apocalyptic number.

81416427 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

81416427 is a deficient number, since it is larger than the sum of its proper divisors (33007413).

81416427 is a wasteful number, since it uses less digits than its factorization.

81416427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17742.

The product of its digits is 10752, while the sum is 33.

The square root of 81416427 is about 9023.1051750492. The cubic root of 81416427 is about 433.4150752437.

The spelling of 81416427 in words is "eighty-one million, four hundred sixteen thousand, four hundred twenty-seven".