81924434 has 8 divisors (see below), whose sum is σ = 123078528. Its totient is φ = 40898260.

The previous prime is 81924419. The next prime is 81924439. The reversal of 81924434 is 43442918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81924434² = 13423225772440712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81924394 and 81924403.

It is not an unprimeable number, because it can be changed into a prime (81924439) 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, 30362 + ... + 32949.

It is an arithmetic number, because the mean of its divisors is an integer number (15384816).

Almost surely, 2^81924434 is an apocalyptic number.

81924434 is a deficient number, since it is larger than the sum of its proper divisors (41154094).

81924434 is a wasteful number, since it uses less digits than its factorization.

81924434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63960.

The product of its digits is 27648, while the sum is 35.

The square root of 81924434 is about 9051.2117420818. The cubic root of 81924434 is about 434.3146542740.

The spelling of 81924434 in words is "eighty-one million, nine hundred twenty-four thousand, four hundred thirty-four".