81290486 has 8 divisors (see below), whose sum is σ = 121974024. Its totient is φ = 40632480.

The previous prime is 81290483. The next prime is 81290507. The reversal of 81290486 is 68409218.

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

It is a super-2 number, since 2×81290486² = 13216286228232392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81290483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8846 + ... + 15518.

It is an arithmetic number, because the mean of its divisors is an integer number (15246753).

Almost surely, 2^81290486 is an apocalyptic number.

81290486 is a deficient number, since it is larger than the sum of its proper divisors (40683538).

81290486 is a wasteful number, since it uses less digits than its factorization.

81290486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12766.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81290486 is about 9016.1236681847. The cubic root of 81290486 is about 433.1914803278.

The spelling of 81290486 in words is "eighty-one million, two hundred ninety thousand, four hundred eighty-six".