81741626 has 8 divisors (see below), whose sum is σ = 122673204. Its totient is φ = 40850560.

The previous prime is 81741613. The next prime is 81741641. The reversal of 81741626 is 62614718.

It can be written as a sum of positive squares in 2 ways, for example, as 57229225 + 24512401 = 7565^2 + 4951^2 .

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

It is a super-2 number, since 2×81741626² = 13363386842247752, which contains 22 as substring.

It is a Curzon number.

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, 4445 + ... + 13536.

Almost surely, 2^81741626 is an apocalyptic number.

81741626 is a deficient number, since it is larger than the sum of its proper divisors (40931578).

81741626 is a wasteful number, since it uses less digits than its factorization.

81741626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20256.

The product of its digits is 16128, while the sum is 35.

The square root of 81741626 is about 9041.1075648949. The cubic root of 81741626 is about 433.9913672389.

The spelling of 81741626 in words is "eighty-one million, seven hundred forty-one thousand, six hundred twenty-six".