81743504 has 30 divisors (see below), whose sum is σ = 162701826. Its totient is φ = 39761920.

The previous prime is 81743483. The next prime is 81743509. The reversal of 81743504 is 40534718.

It can be written as a sum of positive squares in 3 ways, for example, as 21904 + 81721600 = 148^2 + 9040^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81743509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 231392 + ... + 231744.

Almost surely, 2^81743504 is an apocalyptic number.

It is an amenable number.

81743504 is a deficient number, since it is larger than the sum of its proper divisors (80958322).

81743504 is an equidigital number, since it uses as much as digits as its factorization.

81743504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 81743504 is about 9041.2114232552. The cubic root of 81743504 is about 433.9946908395.

The spelling of 81743504 in words is "eighty-one million, seven hundred forty-three thousand, five hundred four".