81130270 has 64 divisors (see below), whose sum is σ = 164094336. Its totient is φ = 28684800.

The previous prime is 81130261. The next prime is 81130277. The reversal of 81130270 is 7203118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 485727 + ... + 485893.

It is an arithmetic number, because the mean of its divisors is an integer number (2563974).

Almost surely, 2^81130270 is an apocalyptic number.

81130270 is an abundant number, since it is smaller than the sum of its proper divisors (82964066).

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

81130270 is a wasteful number, since it uses less digits than its factorization.

81130270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 81130270 is about 9007.2343147050. The cubic root of 81130270 is about 432.9066997586.

Adding to 81130270 its reverse (7203118), we get a palindrome (88333388).

The spelling of 81130270 in words is "eighty-one million, one hundred thirty thousand, two hundred seventy".