81435464 has 32 divisors (see below), whose sum is σ = 170454240. Its totient is φ = 36153600.

The previous prime is 81435461. The next prime is 81435467. The reversal of 81435464 is 46453418.

It is an interprime number because it is at equal distance from previous prime (81435461) and next prime (81435467).

It is not an unprimeable number, because it can be changed into a prime (81435461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6977 + ... + 14544.

It is an arithmetic number, because the mean of its divisors is an integer number (5326695).

Almost surely, 2^81435464 is an apocalyptic number.

It is an amenable number.

81435464 is an abundant number, since it is smaller than the sum of its proper divisors (89018776).

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

81435464 is a wasteful number, since it uses less digits than its factorization.

81435464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21581 (or 21577 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 81435464 is about 9024.1600163118. The cubic root of 81435464 is about 433.4488533566.

It can be divided in two parts, 814354 and 64, that added together give a palindrome (814418).

The spelling of 81435464 in words is "eighty-one million, four hundred thirty-five thousand, four hundred sixty-four".