81006590 has 16 divisors (see below), whose sum is σ = 166642272. Its totient is φ = 27773664.

The previous prime is 81006577. The next prime is 81006613. The reversal of 81006590 is 9560018.

It is a congruent number.

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, 578549 + ... + 578688.

It is an arithmetic number, because the mean of its divisors is an integer number (10415142).

Almost surely, 2^81006590 is an apocalyptic number.

81006590 is an abundant number, since it is smaller than the sum of its proper divisors (85635682).

81006590 is a wasteful number, since it uses less digits than its factorization.

81006590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157251.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 81006590 is about 9000.3661036649. The cubic root of 81006590 is about 432.6866046316.

The spelling of 81006590 in words is "eighty-one million, six thousand, five hundred ninety".