81527270 has 32 divisors (see below), whose sum is σ = 164003616. Its totient is φ = 28921600.

The previous prime is 81527263. The next prime is 81527273. The reversal of 81527270 is 7272518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81527273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4529 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (5125113).

Almost surely, 2^81527270 is an apocalyptic number.

81527270 is an abundant number, since it is smaller than the sum of its proper divisors (82476346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81527270 is a wasteful number, since it uses less digits than its factorization.

81527270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18136.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 81527270 is about 9029.2452619253. The cubic root of 81527270 is about 433.6116745619.

Adding to 81527270 its reverse (7272518), we get a palindrome (88799788).

The spelling of 81527270 in words is "eighty-one million, five hundred twenty-seven thousand, two hundred seventy".