64002440 has 16 divisors (see below), whose sum is σ = 144005580. Its totient is φ = 25600960.

The previous prime is 64002413. The next prime is 64002451. The reversal of 64002440 is 4420046.

It can be written as a sum of positive squares in 2 ways, for example, as 61371556 + 2630884 = 7834^2 + 1622^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 799991 + ... + 800070.

Almost surely, 2^64002440 is an apocalyptic number.

It is an amenable number.

64002440 is an abundant number, since it is smaller than the sum of its proper divisors (80003140).

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

64002440 is a wasteful number, since it uses less digits than its factorization.

64002440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600072 (or 1600068 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 64002440 is about 8000.1524985465. The cubic root of 64002440 is about 400.0050832687.

Adding to 64002440 its reverse (4420046), we get a palindrome (68422486).

The spelling of 64002440 in words is "sixty-four million, two thousand, four hundred forty".