81067420 has 24 divisors (see below), whose sum is σ = 194562144. Its totient is φ = 27794496.

The previous prime is 81067417. The next prime is 81067423. The reversal of 81067420 is 2476018.

It is an interprime number because it is at equal distance from previous prime (81067417) and next prime (81067423).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81067423) 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, 289387 + ... + 289666.

It is an arithmetic number, because the mean of its divisors is an integer number (8106756).

Almost surely, 2^81067420 is an apocalyptic number.

It is an amenable number.

81067420 is an abundant number, since it is smaller than the sum of its proper divisors (113494724).

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

81067420 is a wasteful number, since it uses less digits than its factorization.

81067420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579069 (or 579067 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81067420 is about 9003.7447764805. The cubic root of 81067420 is about 432.7948828211.

The spelling of 81067420 in words is "eighty-one million, sixty-seven thousand, four hundred twenty".