84471440 has 20 divisors (see below), whose sum is σ = 196396284. Its totient is φ = 33788544.

The previous prime is 84471379. The next prime is 84471463. The reversal of 84471440 is 4417448.

It can be written as a sum of positive squares in 2 ways, for example, as 23193856 + 61277584 = 4816^2 + 7828^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 84471397 and 84471406.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 527867 + ... + 528026.

Almost surely, 2^84471440 is an apocalyptic number.

84471440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84471440 is an abundant number, since it is smaller than the sum of its proper divisors (111924844).

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

84471440 is a wasteful number, since it uses less digits than its factorization.

84471440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055906 (or 1055900 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 84471440 is about 9190.8345649348. The cubic root of 84471440 is about 438.7697036359.

Adding to 84471440 its reverse (4417448), we get a palindrome (88888888).

The spelling of 84471440 in words is "eighty-four million, four hundred seventy-one thousand, four hundred forty".