81349026 has 48 divisors (see below), whose sum is σ = 180986400. Its totient is φ = 24354880.

The previous prime is 81349007. The next prime is 81349027. The reversal of 81349026 is 62094318.

It is a super-2 number, since 2×81349026² = 13235328062297352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81349027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63985 + ... + 65243.

It is an arithmetic number, because the mean of its divisors is an integer number (3770550).

Almost surely, 2^81349026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81349026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90493200).

81349026 is an abundant number, since it is smaller than the sum of its proper divisors (99637374).

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

81349026 is a wasteful number, since it uses less digits than its factorization.

81349026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 81349026 is about 9019.3694901584. The cubic root of 81349026 is about 433.2954406051.

The spelling of 81349026 in words is "eighty-one million, three hundred forty-nine thousand, twenty-six".