81960460 has 24 divisors (see below), whose sum is σ = 172519200. Its totient is φ = 32707584.

The previous prime is 81960449. The next prime is 81960469. The reversal of 81960460 is 6406918.

It is not an unprimeable number, because it can be changed into a prime (81960469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4417 + ... + 13543.

It is an arithmetic number, because the mean of its divisors is an integer number (7188300).

Almost surely, 2^81960460 is an apocalyptic number.

It is an amenable number.

81960460 is an abundant number, since it is smaller than the sum of its proper divisors (90558740).

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

81960460 is a wasteful number, since it uses less digits than its factorization.

81960460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9585 (or 9583 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 81960460 is about 9053.2016436176. The cubic root of 81960460 is about 434.3783077574.

The spelling of 81960460 in words is "eighty-one million, nine hundred sixty thousand, four hundred sixty".