81470120 has 32 divisors (see below), whose sum is σ = 194092200. Its totient is φ = 30670848.

The previous prime is 81470111. The next prime is 81470131. The reversal of 81470120 is 2107418.

It can be written as a sum of positive squares in 4 ways, for example, as 81468676 + 1444 = 9026^2 + 38^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59225 + ... + 60584.

Almost surely, 2^81470120 is an apocalyptic number.

It is an amenable number.

81470120 is an abundant number, since it is smaller than the sum of its proper divisors (112622080).

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

81470120 is a wasteful number, since it uses less digits than its factorization.

81470120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119837 (or 119833 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81470120 is about 9026.0799907823. The cubic root of 81470120 is about 433.5103313759.

Adding to 81470120 its reverse (2107418), we get a palindrome (83577538).

The spelling of 81470120 in words is "eighty-one million, four hundred seventy thousand, one hundred twenty".