81030790 has 8 divisors (see below), whose sum is σ = 145855440. Its totient is φ = 32412312.

The previous prime is 81030787. The next prime is 81030811. The reversal of 81030790 is 9703018.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4051530 + ... + 4051549.

It is an arithmetic number, because the mean of its divisors is an integer number (18231930).

Almost surely, 2^81030790 is an apocalyptic number.

81030790 is a deficient number, since it is larger than the sum of its proper divisors (64824650).

81030790 is a wasteful number, since it uses less digits than its factorization.

81030790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8103086.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 81030790 is about 9001.7103930309. The cubic root of 81030790 is about 432.7296874364.

The spelling of 81030790 in words is "eighty-one million, thirty thousand, seven hundred ninety".