81348420 has 24 divisors (see below), whose sum is σ = 227775744. Its totient is φ = 21692896.

The previous prime is 81348359. The next prime is 81348427. The reversal of 81348420 is 2484318.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81348427) 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, 677844 + ... + 677963.

It is an arithmetic number, because the mean of its divisors is an integer number (9490656).

Almost surely, 2^81348420 is an apocalyptic number.

It is an amenable number.

81348420 is an abundant number, since it is smaller than the sum of its proper divisors (146427324).

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

81348420 is a wasteful number, since it uses less digits than its factorization.

81348420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355819 (or 1355817 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 81348420 is about 9019.3358957298. The cubic root of 81348420 is about 433.2943646746.

The spelling of 81348420 in words is "eighty-one million, three hundred forty-eight thousand, four hundred twenty".