81426464 has 48 divisors (see below), whose sum is σ = 193995648. Its totient is φ = 32842752.

The previous prime is 81426439. The next prime is 81426467. The reversal of 81426464 is 46462418.

It is not an unprimeable number, because it can be changed into a prime (81426467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6884 + ... + 14499.

It is an arithmetic number, because the mean of its divisors is an integer number (4041576).

Almost surely, 2^81426464 is an apocalyptic number.

It is an amenable number.

81426464 is an abundant number, since it is smaller than the sum of its proper divisors (112569184).

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

81426464 is a wasteful number, since it uses less digits than its factorization.

81426464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21417 (or 21409 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 81426464 is about 9023.6613411630. The cubic root of 81426464 is about 433.4328849516.

The spelling of 81426464 in words is "eighty-one million, four hundred twenty-six thousand, four hundred sixty-four".