53780240 has 40 divisors (see below), whose sum is σ = 128425560. Its totient is φ = 20929536.

The previous prime is 53780227. The next prime is 53780249. The reversal of 53780240 is 4208735.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6390784 + 47389456 = 2528^2 + 6884^2 .

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

It is not an unprimeable number, because it can be changed into a prime (53780249) 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, 6125 + ... + 12044.

It is an arithmetic number, because the mean of its divisors is an integer number (3210639).

Almost surely, 2^53780240 is an apocalyptic number.

It is an amenable number.

53780240 is an abundant number, since it is smaller than the sum of its proper divisors (74645320).

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

53780240 is a wasteful number, since it uses less digits than its factorization.

53780240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18219 (or 18213 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 53780240 is about 7333.5012101997. The cubic root of 53780240 is about 377.4628766324.

Adding to 53780240 its reverse (4208735), we get a palindrome (57988975).

The spelling of 53780240 in words is "fifty-three million, seven hundred eighty thousand, two hundred forty".