81029310 has 32 divisors (see below), whose sum is σ = 205911072. Its totient is φ = 20336640.

The previous prime is 81029309. The next prime is 81029317. The reversal of 81029310 is 1392018.

It is a super-2 number, since 2×81029310² = 13131498158152200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81029317) 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, 78931 + ... + 79950.

It is an arithmetic number, because the mean of its divisors is an integer number (6434721).

Almost surely, 2^81029310 is an apocalyptic number.

81029310 is an abundant number, since it is smaller than the sum of its proper divisors (124881762).

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

81029310 is a wasteful number, since it uses less digits than its factorization.

81029310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158908.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 81029310 is about 9001.6281860561. The cubic root of 81029310 is about 432.7270528665.

The spelling of 81029310 in words is "eighty-one million, twenty-nine thousand, three hundred ten".