81030490 has 16 divisors (see below), whose sum is σ = 149247648. Its totient is φ = 31658256.

The previous prime is 81030487. The next prime is 81030503. The reversal of 81030490 is 9403018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93792 + ... + 94651.

It is an arithmetic number, because the mean of its divisors is an integer number (9327978).

Almost surely, 2^81030490 is an apocalyptic number.

81030490 is a deficient number, since it is larger than the sum of its proper divisors (68217158).

81030490 is a wasteful number, since it uses less digits than its factorization.

81030490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188493.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81030490 is about 9001.6937295156. The cubic root of 81030490 is about 432.7291534045.

The spelling of 81030490 in words is "eighty-one million, thirty thousand, four hundred ninety".