81423080 has 32 divisors (see below), whose sum is σ = 187466400. Its totient is φ = 31811136.

The previous prime is 81423079. The next prime is 81423091. The reversal of 81423080 is 8032418.

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, 21950 + ... + 25389.

It is an arithmetic number, because the mean of its divisors is an integer number (5858325).

Almost surely, 2^81423080 is an apocalyptic number.

It is an amenable number.

81423080 is an abundant number, since it is smaller than the sum of its proper divisors (106043320).

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

81423080 is a wasteful number, since it uses less digits than its factorization.

81423080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47393 (or 47389 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81423080 is about 9023.4738321779. The cubic root of 81423080 is about 433.4268805270.

Adding to 81423080 its reverse (8032418), we get a palindrome (89455498).

The spelling of 81423080 in words is "eighty-one million, four hundred twenty-three thousand, eighty".