81416478 has 64 divisors (see below), whose sum is σ = 197535744. Its totient is φ = 22032000.

The previous prime is 81416473. The next prime is 81416479. The reversal of 81416478 is 87461418.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25068 + ... + 28128.

It is an arithmetic number, because the mean of its divisors is an integer number (3086496).

Almost surely, 2^81416478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81416478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98767872).

81416478 is an abundant number, since it is smaller than the sum of its proper divisors (116119266).

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

81416478 is a wasteful number, since it uses less digits than its factorization.

81416478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121.

The product of its digits is 43008, while the sum is 39.

The square root of 81416478 is about 9023.1080011269. The cubic root of 81416478 is about 433.4151657420.

The spelling of 81416478 in words is "eighty-one million, four hundred sixteen thousand, four hundred seventy-eight".