81295420 has 24 divisors (see below), whose sum is σ = 170962848. Its totient is φ = 32472000.

The previous prime is 81295387. The next prime is 81295427. The reversal of 81295420 is 2459218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81295427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13945 + ... + 18895.

It is an arithmetic number, because the mean of its divisors is an integer number (7123452).

Almost surely, 2^81295420 is an apocalyptic number.

It is an amenable number.

81295420 is an abundant number, since it is smaller than the sum of its proper divisors (89667428).

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

81295420 is a wasteful number, since it uses less digits than its factorization.

81295420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781 (or 5779 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81295420 is about 9016.3972849470. The cubic root of 81295420 is about 433.2002444674.

The spelling of 81295420 in words is "eighty-one million, two hundred ninety-five thousand, four hundred twenty".