81423408 has 40 divisors (see below), whose sum is σ = 229467456. Its totient is φ = 24673600.

The previous prime is 81423401. The next prime is 81423409. The reversal of 81423408 is 80432418.

It is not an unprimeable number, because it can be changed into a prime (81423401) 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, 76578 + ... + 77633.

Almost surely, 2^81423408 is an apocalyptic number.

81423408 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81423408 is an abundant number, since it is smaller than the sum of its proper divisors (148044048).

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

81423408 is a wasteful number, since it uses less digits than its factorization.

81423408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154233 (or 154227 counting only the distinct ones).

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

The square root of 81423408 is about 9023.4920069782. The cubic root of 81423408 is about 433.4274625234.

The spelling of 81423408 in words is "eighty-one million, four hundred twenty-three thousand, four hundred eight".