81027550 has 12 divisors (see below), whose sum is σ = 150711336. Its totient is φ = 32411000.

The previous prime is 81027539. The next prime is 81027563. The reversal of 81027550 is 5572018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 810226 + ... + 810325.

It is an arithmetic number, because the mean of its divisors is an integer number (12559278).

Almost surely, 2^81027550 is an apocalyptic number.

81027550 is a deficient number, since it is larger than the sum of its proper divisors (69683786).

81027550 is a wasteful number, since it uses less digits than its factorization.

81027550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620563 (or 1620558 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 81027550 is about 9001.5304254332. The cubic root of 81027550 is about 432.7239198227.

Adding to 81027550 its reverse (5572018), we get a palindrome (86599568).

The spelling of 81027550 in words is "eighty-one million, twenty-seven thousand, five hundred fifty".