81030646 has 4 divisors (see below), whose sum is σ = 121545972. Its totient is φ = 40515322.

The previous prime is 81030641. The next prime is 81030661. The reversal of 81030646 is 64603018.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×81030646³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20257660 + ... + 20257663.

It is an arithmetic number, because the mean of its divisors is an integer number (30386493).

Almost surely, 2^81030646 is an apocalyptic number.

81030646 is a deficient number, since it is larger than the sum of its proper divisors (40515326).

81030646 is a wasteful number, since it uses less digits than its factorization.

81030646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40515325.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 81030646 is about 9001.7023945474. The cubic root of 81030646 is about 432.7294311013.

The spelling of 81030646 in words is "eighty-one million, thirty thousand, six hundred forty-six".