81207330 has 32 divisors (see below), whose sum is σ = 205156800. Its totient is φ = 20515392.

The previous prime is 81207281. The next prime is 81207331. The reversal of 81207330 is 3370218.

It is a self number, because there is not a number n which added to its sum of digits gives 81207330.

It is not an unprimeable number, because it can be changed into a prime (81207331) 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, 70665 + ... + 71804.

It is an arithmetic number, because the mean of its divisors is an integer number (6411150).

Almost surely, 2^81207330 is an apocalyptic number.

81207330 is an abundant number, since it is smaller than the sum of its proper divisors (123949470).

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

81207330 is a wasteful number, since it uses less digits than its factorization.

81207330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142498.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 81207330 is about 9011.5109720845. The cubic root of 81207330 is about 433.0437190396.

Adding to 81207330 its reverse (3370218), we get a palindrome (84577548).

The spelling of 81207330 in words is "eighty-one million, two hundred seven thousand, three hundred thirty".