81734424 has 16 divisors (see below), whose sum is σ = 204336120. Its totient is φ = 27244800.

The previous prime is 81734423. The next prime is 81734459. The reversal of 81734424 is 42443718.

It is a super-2 number, since 2×81734424² = 13361032133223552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81734423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1702777 + ... + 1702824.

Almost surely, 2^81734424 is an apocalyptic number.

It is an amenable number.

81734424 is an abundant number, since it is smaller than the sum of its proper divisors (122601696).

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

81734424 is a wasteful number, since it uses less digits than its factorization.

81734424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405610 (or 3405606 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 81734424 is about 9040.7092642115. The cubic root of 81734424 is about 433.9786209888.

The spelling of 81734424 in words is "eighty-one million, seven hundred thirty-four thousand, four hundred twenty-four".