81744026 has 64 divisors (see below), whose sum is σ = 158323200. Its totient is φ = 30792960.

The previous prime is 81743999. The next prime is 81744029. The reversal of 81744026 is 62044718.

It is a junction number, because it is equal to n+sod(n) for n = 81743983 and 81744001.

It is not an unprimeable number, because it can be changed into a prime (81744029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410675 + ... + 410873.

It is an arithmetic number, because the mean of its divisors is an integer number (2473800).

Almost surely, 2^81744026 is an apocalyptic number.

81744026 is a deficient number, since it is larger than the sum of its proper divisors (76579174).

81744026 is a wasteful number, since it uses less digits than its factorization.

81744026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 81744026 is about 9041.2402910220. The cubic root of 81744026 is about 433.9956146428.

The spelling of 81744026 in words is "eighty-one million, seven hundred forty-four thousand, twenty-six".