81344510 has 32 divisors (see below), whose sum is σ = 165987360. Its totient is φ = 28453248.

The previous prime is 81344479. The next prime is 81344521. The reversal of 81344510 is 1544318.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 81344510.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13997 + ... + 18936.

It is an arithmetic number, because the mean of its divisors is an integer number (5187105).

Almost surely, 2^81344510 is an apocalyptic number.

81344510 is an abundant number, since it is smaller than the sum of its proper divisors (84642850).

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

81344510 is a wasteful number, since it uses less digits than its factorization.

81344510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32972.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81344510 is about 9019.1191365898. The cubic root of 81344510 is about 433.2874224864.

Adding to 81344510 its reverse (1544318), we get a palindrome (82888828).

The spelling of 81344510 in words is "eighty-one million, three hundred forty-four thousand, five hundred ten".