81234478 has 32 divisors (see below), whose sum is σ = 134882496. Its totient is φ = 36461568.

The previous prime is 81234431. The next prime is 81234479. The reversal of 81234478 is 87443218.

It is a super-4 number, since 4×81234478⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81234479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229950 + ... + 230302.

It is an arithmetic number, because the mean of its divisors is an integer number (4215078).

Almost surely, 2^81234478 is an apocalyptic number.

81234478 is a deficient number, since it is larger than the sum of its proper divisors (53648018).

81234478 is a wasteful number, since it uses less digits than its factorization.

81234478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588.

The product of its digits is 43008, while the sum is 37.

The square root of 81234478 is about 9013.0171418898. The cubic root of 81234478 is about 433.0919698608.

The spelling of 81234478 in words is "eighty-one million, two hundred thirty-four thousand, four hundred seventy-eight".