81734516 has 6 divisors (see below), whose sum is σ = 143035410. Its totient is φ = 40867256.

The previous prime is 81734509. The next prime is 81734519. The reversal of 81734516 is 61543718.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 1094116 = 8980^2 + 1046^2 .

It is a super-2 number, since 2×81734516² = 13361062211508512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81734519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216811 + ... + 10216818.

It is an arithmetic number, because the mean of its divisors is an integer number (23839235).

Almost surely, 2^81734516 is an apocalyptic number.

It is an amenable number.

81734516 is a deficient number, since it is larger than the sum of its proper divisors (61300894).

81734516 is a wasteful number, since it uses less digits than its factorization.

81734516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20433633 (or 20433631 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 81734516 is about 9040.7143523065. The cubic root of 81734516 is about 433.9787838171.

The spelling of 81734516 in words is "eighty-one million, seven hundred thirty-four thousand, five hundred sixteen".