81450344 has 16 divisors (see below), whose sum is σ = 153694500. Its totient is φ = 40465152.

The previous prime is 81450233. The next prime is 81450353. The reversal of 81450344 is 44305418.

It can be written as a sum of positive squares in 2 ways, for example, as 79887844 + 1562500 = 8938^2 + 1250^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31169 + ... + 33680.

Almost surely, 2^81450344 is an apocalyptic number.

It is an amenable number.

81450344 is a deficient number, since it is larger than the sum of its proper divisors (72244156).

81450344 is a wasteful number, since it uses less digits than its factorization.

81450344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65012 (or 65008 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 81450344 is about 9024.9844321195. The cubic root of 81450344 is about 433.4752518723.

The spelling of 81450344 in words is "eighty-one million, four hundred fifty thousand, three hundred forty-four".