1564240240 has 40 divisors (see below), whose sum is σ = 3721444848. Its totient is φ = 611143680.

The previous prime is 1564240219. The next prime is 1564240243. The reversal of 1564240240 is 420424651.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1564240199 and 1564240208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564240243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223921 + ... + 230800.

Almost surely, 2^1564240240 is an apocalyptic number.

1564240240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1564240240 is an abundant number, since it is smaller than the sum of its proper divisors (2157204608).

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

1564240240 is a wasteful number, since it uses less digits than its factorization.

1564240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454777 (or 454771 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1564240240 is about 39550.4771146948. The cubic root of 1564240240 is about 1160.8278474236.

Adding to 1564240240 its reverse (420424651), we get a palindrome (1984664891).

The spelling of 1564240240 in words is "one billion, five hundred sixty-four million, two hundred forty thousand, two hundred forty".