81419310 has 128 divisors (see below), whose sum is σ = 259061760. Its totient is φ = 17791488.

The previous prime is 81419297. The next prime is 81419311. The reversal of 81419310 is 1391418.

It is a super-2 number, since 2×81419310² = 13258208081752200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81419311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42534 + ... + 44406.

It is an arithmetic number, because the mean of its divisors is an integer number (2023920).

Almost surely, 2^81419310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81419310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129530880).

81419310 is an abundant number, since it is smaller than the sum of its proper divisors (177642450).

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

81419310 is a wasteful number, since it uses less digits than its factorization.

81419310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 81419310 is about 9023.2649301680. The cubic root of 81419310 is about 433.4201910045.

The spelling of 81419310 in words is "eighty-one million, four hundred nineteen thousand, three hundred ten".