64471240 has 16 divisors (see below), whose sum is σ = 145060380. Its totient is φ = 25788480.

The previous prime is 64471223. The next prime is 64471271. The reversal of 64471240 is 4217446.

64471240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60621796 + 3849444 = 7786^2 + 1962^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64471199 and 64471208.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 805851 + ... + 805930.

Almost surely, 2^64471240 is an apocalyptic number.

It is an amenable number.

64471240 is an abundant number, since it is smaller than the sum of its proper divisors (80589140).

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

64471240 is a wasteful number, since it uses less digits than its factorization.

64471240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611792 (or 1611788 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 64471240 is about 8029.3984830746. The cubic root of 64471240 is about 400.9793502259.

Adding to 64471240 its reverse (4217446), we get a palindrome (68688686).

The spelling of 64471240 in words is "sixty-four million, four hundred seventy-one thousand, two hundred forty".